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_raw_scoped_refptr_mismatch_checker.h

@@ -46,7 +46,7 @@
 
 namespace base {
 
-namespace internal {
+namespace cef_internal {
 
 template <typename T>
 struct NeedsScopedRefptrButGetsRawPtr {
@@ -147,7 +147,7 @@ struct ParamsUseScopedRefptrCorrectly<Tuple8<A, B, C, D, E, F, G, H> > {
                    NeedsScopedRefptrButGetsRawPtr<H>::value) };
 };
 
-}  // namespace internal
+}  // namespace cef_internal
 
 }  // namespace base