Consistently use "use strict" where possible.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/789163002

Cr-Commit-Position: refs/heads/master@{#25748}

src/array-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 
 // This file relies on the fact that the following declaration has been made

src/collection-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 
 // This file relies on the fact that the following declaration has been made

src/harmony-classes.js

@@ -7,6 +7,8 @@
 // var $Function = global.Function;
 // var $Array = global.Array;
 
+"use strict";
+
 
 (function() {
   function FunctionToMethod(homeObject) {

src/harmony-string.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:

src/harmony-templates.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 var callSiteCache = new $Map;
 

src/harmony-tostring.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js and symbol.js:

src/harmony-typedarray.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:

src/liveedit-debugger.js

@@ -19,6 +19,9 @@
 // All unchanged functions have their positions updated accordingly.
 //
 // LiveEdit namespace is declared inside a single function constructor.
+
+"use strict";
+
 Debug.LiveEdit = new function() {
 
   // Forward declaration for minifier.
@@ -953,7 +956,7 @@ Debug.LiveEdit = new function() {
 
   FunctionPatchabilityStatus.SymbolName = function(code) {
     var enumeration = FunctionPatchabilityStatus;
-    for (name in enumeration) {
+    for (var name in enumeration) {
       if (enumeration[name] == code) {
         return name;
       }

src/string-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+"use strict";
 
 
 // This file relies on the fact that the following declaration has been made