Expose the GC under a name that is less collision prone than window.gc.

src/extensions/gc-extension.h

 // Copyright 2010 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 #ifndef V8_EXTENSIONS_GC_EXTENSION_H_
 #define V8_EXTENSIONS_GC_EXTENSION_H_
 
 #include "v8.h"
 
 namespace v8 {
 namespace internal {
 
 class GCExtension : public v8::Extension {
  public:
-  GCExtension() : v8::Extension("v8/gc", kSource) {}
+  explicit GCExtension(const char* source) : v8::Extension("v8/gc", source) {}
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
       v8::Handle<v8::String> name);
   static v8::Handle<v8::Value> GC(const v8::Arguments& args);
   static void Register();
- private:
-  static const char* const kSource;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXTENSIONS_GC_EXTENSION_H_