Use Marshal.ZeroFreeCoTaskMemUnicode

This removes the ClrFacade function of the same name as this API is in
.NET Core 1.0 Marhsal class, not SecureStringMarshal.

src/Microsoft.PackageManagement/providers/inbox/Common/Utility/PathUtility.cs

@@ -192,7 +192,7 @@ namespace Microsoft.PackageManagement.Provider.Utility
 #if !CORECLR
                 Marshal.ZeroFreeGlobalAllocUnicode(value);
 #else
-                SecureStringMarshal.ZeroFreeCoTaskMemUnicode(value);
+                Marshal.ZeroFreeCoTaskMemUnicode(value);
 #endif
             }
         }

src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/cimConverter.cs

@@ -96,7 +96,7 @@ namespace Microsoft.PowerShell.Cim
                 }
                 finally
                 {
-                    ClrFacade.ZeroFreeCoTaskMemUnicode(plainTextString);
+                    Marshal.ZeroFreeCoTaskMemUnicode(plainTextString);
                 }
             }
 

src/Microsoft.PowerShell.Commands.Management/commands/management/Process.cs

@@ -2574,7 +2574,7 @@ namespace Microsoft.PowerShell.Commands
                     {
                         if (password != IntPtr.Zero)
                         {
-                            ClrFacade.ZeroFreeCoTaskMemUnicode(password);
+                            Marshal.ZeroFreeCoTaskMemUnicode(password);
                         }
                     }
                 }//end of if

src/Microsoft.PowerShell.Commands.Management/commands/management/Service.cs

@@ -2230,7 +2230,7 @@ namespace Microsoft.PowerShell.Commands
             {
                 if (IntPtr.Zero != password)
                 {
-                    ClrFacade.ZeroFreeCoTaskMemUnicode(password);
+                    Marshal.ZeroFreeCoTaskMemUnicode(password);
                 }
 
                 if (IntPtr.Zero != hService)

src/Microsoft.PowerShell.LocalAccounts/LocalAccounts/Extensions.cs

@@ -160,7 +160,7 @@ namespace System.Management.Automation.SecurityAccountsManager.Extensions
 #if CORECLR
             IntPtr buffer = SecureStringMarshal.SecureStringToCoTaskMemUnicode(str);
             string clear = Marshal.PtrToStringUni(buffer);
-            SecureStringMarshal.ZeroFreeCoTaskMemUnicode(buffer);
+            Marshal.ZeroFreeCoTaskMemUnicode(buffer);
 #else
             var bstr = Marshal.SecureStringToBSTR(str);
             string clear = Marshal.PtrToStringAuto(bstr);

src/System.Management.Automation/engine/Credential.cs

@@ -9,6 +9,7 @@ using System.Net;
 using System.Security;
 using SafeString=System.String;
 using System.Runtime.Serialization;
+using System.Runtime.InteropServices;
 using System.Security.Cryptography;
 using Microsoft.PowerShell;
 
@@ -286,7 +287,7 @@ namespace System.Management.Automation
                     {
                         if (unmanagedPtr != IntPtr.Zero)
                         {
-                            ClrFacade.ZeroFreeCoTaskMemUnicode(unmanagedPtr);
+                            Marshal.ZeroFreeCoTaskMemUnicode(unmanagedPtr);
                         }
                     }
 #else

src/System.Management.Automation/engine/Utils.cs

@@ -179,7 +179,7 @@ namespace System.Management.Automation
             {
                 if (p != IntPtr.Zero)
                 {
-                    ClrFacade.ZeroFreeCoTaskMemUnicode(p);
+                    Marshal.ZeroFreeCoTaskMemUnicode(p);
                 }
             }
 

src/System.Management.Automation/engine/remoting/fanin/WSManNativeAPI.cs

@@ -379,7 +379,7 @@ namespace System.Management.Automation.Remoting.Client
             {
                 if (cred.password != IntPtr.Zero)
                 {
-                    ClrFacade.ZeroFreeCoTaskMemUnicode(cred.password);
+                    Marshal.ZeroFreeCoTaskMemUnicode(cred.password);
                     cred.password = IntPtr.Zero;
                 }
 

src/System.Management.Automation/security/SecureStringHelper.cs

@@ -94,7 +94,7 @@ namespace Microsoft.PowerShell
                 }
                 finally
                 {
-                    ClrFacade.ZeroFreeCoTaskMemUnicode(ptr);
+                    Marshal.ZeroFreeCoTaskMemUnicode(ptr);
                 }
             }
 

src/System.Management.Automation/utils/ClrFacade.cs

@@ -148,7 +148,7 @@ namespace System.Management.Automation
             {
                 if (unmanagedMemory != IntPtr.Zero)
                 {
-                    ZeroFreeCoTaskMemUnicode(unmanagedMemory);
+                    Marshal.ZeroFreeCoTaskMemUnicode(unmanagedMemory);
                 }
             }
             return passwordInClearText;
@@ -213,19 +213,6 @@ namespace System.Management.Automation
 #endif
         }
 
-        /// <summary>
-        /// Needed to pair with the  SecureStringToCoTaskMemUnicode method which is member of 
-        /// 'SecureStringMarshal' on CORE CLR, and member of 'Marshal' on Full CLR.
-        /// </summary>
-        internal static void ZeroFreeCoTaskMemUnicode(IntPtr unmanagedStr)
-        {
-#if CORECLR
-            SecureStringMarshal.ZeroFreeCoTaskMemUnicode(unmanagedStr);
-#else
-            Marshal.ZeroFreeCoTaskMemUnicode(unmanagedStr);
-#endif
-        }
-
         /// <summary>
         /// Facade for SecureStringToCoTaskMemUnicode
         /// </summary>

src/System.Management.Automation/utils/CryptoUtils.cs

@@ -1023,7 +1023,7 @@ namespace System.Management.Automation.Internal
                     {
                         data[i] = Marshal.ReadByte(ptr, i);
                     }
-                    ClrFacade.ZeroFreeCoTaskMemUnicode(ptr);
+                    Marshal.ZeroFreeCoTaskMemUnicode(ptr);
 
                     try
                     {