Update to Chromium revision cb947c01 (#352221)

- Implement CefRequestHandler::OnBeforeBrowse using NavigationThrottle
  instead of ResourceThrottle (see http://crbug.com/537634). The CefRequest
  object passed to OnBeforeBrowse will no longer have an associated request
  identifier.
- Mac: Remove additional helper apps which are no longer required (see
  http://crbug.com/520680)
- Remove the UR_FLAG_REPORT_RAW_HEADERS flag which is no longer supported (see
  http://crbug.com/517114)
- Remove the CefBrowserSettings.java parameter. Java is an NPAPI plugin and
  NPAPI plugins are no longer supported (see http://crbug.com/470301#c11)
- Add CefFormatUrlForSecurityDisplay function in cef_parser.h
- Fix crash when passing `--disable-extensions` command-line flag (issue #1721)
- Linux: Fix NSS handler loading (issue #1727)

libcef/browser/extensions/extension_web_contents_observer.h

@@ -21,6 +21,9 @@ class CefExtensionWebContentsObserver
       content::WebContents* web_contents);
   ~CefExtensionWebContentsObserver() override;
 
+  // content::WebContentsObserver overrides.
+  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
+
   DISALLOW_COPY_AND_ASSIGN(CefExtensionWebContentsObserver);
 };