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/browser/browser_context_impl.h

@@ -27,6 +27,8 @@ class CefBrowserContextImpl : public CefBrowserContext {
 
   // BrowserContext methods.
   base::FilePath GetPath() const override;
+  scoped_ptr<content::ZoomLevelDelegate> CreateZoomLevelDelegate(
+      const base::FilePath& partition_path) override;
   bool IsOffTheRecord() const override;
   content::DownloadManagerDelegate* GetDownloadManagerDelegate() override;
   net::URLRequestContextGetter* GetRequestContext() override;