libcef: Update due to underlying chromium changes.

- More webkit API refactoring.
- Webkit GYP projects moved upstream.
- Add ImplementsThreadSafeReferenceCounting() for all classes that use runnable methods.
- Enable application cache and databases.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@51 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/scheme_impl.cc

@@ -4,6 +4,7 @@
 // found in the LICENSE file.
 
 #include "base/lazy_instance.h"
+#include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/worker_pool.h"
@@ -381,6 +382,8 @@ public:
   void AddRef() {}
   void Release() { delete this; }
 
+  static bool ImplementsThreadSafeReferenceCounting() { return true; }
+
 private:
   CefSchemeHandlerFactory* factory_;
   std::string scheme_name_;