Update to Chromium revision 304f01a1 (#358063)

- Improve ordering of CefLoadHandler callbacks. OnLoadingStateChange will
  be called before and after all calls to OnLoadStart and OnLoadEnd.
  OnLoadStart/OnLoadEnd calls will occur as matching pairs
  (see http://crbug.com/539952#c2).
- Remove the |requesting_url| argument to CefGeolocationHandler::
  OnCancelGeolocationPermission. Clients can use the |request_id| argument
  to track this information themselves.
- Fix a crash when loading the PDF extension in multiple browsers with a
  custom CefRequestContext (issue #1757).

tests/unittests/geolocation_unittest.cc

@@ -110,13 +110,11 @@ class GeolocationTestHandler : public TestHandler {
 
   void OnCancelGeolocationPermission(
       CefRefPtr<CefBrowser> browser,
-      const CefString& requesting_url,
       int request_id) override {
     got_cancelgeolocationpermission_.yes();
 
     EXPECT_TRUE(CefCurrentlyOn(TID_UI));
 
-    EXPECT_STREQ(kTestOrigin, requesting_url.ToString().c_str());
     EXPECT_EQ(request_id, request_id_);
   }