Switch the inheritance of WebViewClient from WebWidgetClient to protected.

third_party/WebKit/Source/web/tests/RootScrollerTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/page/scrolling/RootScroller.h"
 
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/TopControls.h"
 #include "core/html/HTMLFrameOwnerElement.h"
@@ skipping 41 matching lines @@
         WebCache::clear();
     }
 
     WebViewImpl* initialize(const std::string& pageName)
     {
         RuntimeEnabledFeatures::setSetRootScrollerEnabled(true);
 
         // Load a page with large body and set viewport size to 400x400 to
         // ensure main frame is scrollable.
         m_helper.initializeAndLoad(
-            m_baseURL + pageName, true, 0, &m_client, &configureSettings);
+            m_baseURL + pageName, true, nullptr, &m_client, nullptr,
+            &configureSettings);
 
         // Initialize top controls to be shown.
         webViewImpl()->resizeWithTopControls(IntSize(400, 400), 50, true);
         webViewImpl()->topControls().setShownRatio(1);
 
         mainFrameView()->updateAllLifecyclePhases();
 
         return webViewImpl();
     }
 
@@ skipping 407 matching lines @@
 
         ASSERT_EQ(
             iframe->contentDocument()->documentElement(),
             iframe->contentDocument()->rootScroller());
     }
 }
 
 } // namespace
 
 } // namespace blink