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

libcef_dll/base/cef_callback_internal.cc

@@ -7,7 +7,7 @@
 #include "include/base/cef_logging.h"
 
 namespace base {
-namespace internal {
+namespace cef_internal {
 
 void CallbackBase::Reset() {
   polymorphic_invoke_ = NULL;
@@ -30,5 +30,5 @@ CallbackBase::CallbackBase(BindStateBase* bind_state)
 CallbackBase::~CallbackBase() {
 }
 
-}  // namespace internal
+}  // namespace cef_internal
 }  // namespace base