Only define SK_CRASH_HANDLER in crash_handler.

The macro is only used in CrashHandler.*

Removes SK_CRASH_HANDLER from Android's SkUserConfig, where it is not
needed.

Review URL: https://codereview.chromium.org/915663002

gyp/common_conditions.gypi

@@ -659,10 +659,6 @@
       ],
     }],
 
-    [ 'skia_is_bot', {
-      'defines': [ 'SK_CRASH_HANDLER' ],
-    }],
-
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {

gyp/tools.gyp

@@ -50,6 +50,12 @@
         'direct_dependent_settings': {
           'include_dirs': [ '../tools' ],
         },
+        'conditions': [
+          [ 'skia_is_bot', {
+            'defines': [ 'SK_CRASH_HANDLER' ],
+          }],
+        ],
+
         'all_dependent_settings': {
           'msvs_settings': {
             'VCLinkerTool': {