Move core/WebCorePrefixMac.h to build/mac/Prefix.h

Source/platform/blink_platform.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 202 matching lines @@
       'BLINK_PLATFORM_IMPLEMENTATION=1',
       'INSIDE_BLINK',
     ],
     'include_dirs': [
       '<(angle_path)/include',
       '<(SHARED_INTERMEDIATE_DIR)/blink',
     ],
     'xcode_settings': {
       # Some Mac-specific parts of WebKit won't compile without having this
       # prefix header injected.
-      # FIXME: make this a first-class setting.
-      'GCC_PREFIX_HEADER': '../core/WebCorePrefixMac.h',
+      'GCC_PREFIX_HEADER': '<(DEPTH)/third_party/WebKit/Source/build/mac/Prefix.h',
     },
     'sources': [
       '<@(platform_files)',
       '<@(platform_heap_files)',
 
       # Additional .cpp files from platform_generated.gyp:make_platform_generated actions.
       '<(blink_platform_output_dir)/FontFamilyNames.cpp',
       '<(blink_platform_output_dir)/RuntimeEnabledFeatures.cpp',
       '<(blink_platform_output_dir)/RuntimeEnabledFeatures.h',
       '<(blink_platform_output_dir)/ColorData.cpp',
@@ skipping 245 matching lines @@
           ['OS=="android"', {
             'cflags!': ['-mthumb'],
           }],
         ],
       },{  # target_arch!="arm"
         'type': 'none',
       }],
     ],
   }],
 }