Update to Chromium revision 8cb76f56 (#307671)

- Linux/Mac: Load V8 initial snapshot from external bin files (see http://crbug.com/421063).
- Windows: 8.1 SDK is now required (issue #1470).
- Remove CefDOMDocument::GetSelectionStartNode and GetSelectionEndNode methods(see https://codereview.chromium.org/763043004).
- Rename internal namespace used in base headers to avoid linker conflicts with cef_sandbox.lib.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1956 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/base/internal/cef_callback_internal.h

@@ -45,7 +45,7 @@ template <typename T>
 class ScopedVector;
 
 namespace base {
-namespace internal {
+namespace cef_internal {
 
 // BindStateBase is used to provide an opaque handle that the Callback
 // class can use to represent a function object with bound arguments.  It
@@ -199,7 +199,7 @@ typename enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward(T& t) {
   return t.Pass();
 }
 
-}  // namespace internal
+}  // namespace cef_internal
 }  // namespace base
 
 #endif  // CEF_INCLUDE_BASE_INTERNAL_CEF_CALLBACK_INTERNAL_H_