Update to Chromium revision d483fb77 (#474934)

- CefLifeSpanHandler::OnBeforePopup is now called on the UI thread.
- Remove CefBrowserSettings.javascript_open_windows which is no
  longer supported.

libcef/browser/frame_host_impl.h

@@ -66,6 +66,8 @@ class CefFrameHostImpl : public CefFrame {
                       const std::string& scriptUrl,
                       int startLine);
 
+  void ExecuteJavaScriptWithUserGestureForTests(const CefString& javascript);
+
   // Detach the frame from the browser.
   void Detach();