Switch the inheritance of WebViewClient from WebWidgetClient to protected.

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

Index: third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp b/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
index 3fcbdea4a3fd283b09320316ac1a7567c3a97aa4..34fd5454b62e1a35c482bc0878221c5b628cd862 100644
--- a/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
+++ b/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
@@ -118,7 +118,7 @@ public:
     {
         if (!overrideSettingsFunc)
             overrideSettingsFunc = &configureSettings;
-        m_helper.initialize(true, 0, &m_mockWebViewClient, overrideSettingsFunc);
+        m_helper.initialize(true, nullptr, &m_mockWebViewClient, m_mockWebViewClient.widgetClientForTests(), overrideSettingsFunc);
         webViewImpl()->setDefaultPageScaleLimits(1, 4);
     }
 
@@ -126,7 +126,7 @@ public:
     {
         if (!overrideSettingsFunc)
             overrideSettingsFunc = &configureAndroidSettings;
-        m_helper.initialize(true, 0, &m_mockWebViewClient, overrideSettingsFunc);
+        m_helper.initialize(true, nullptr, &m_mockWebViewClient, m_mockWebViewClient.widgetClientForTests(), overrideSettingsFunc);
         webViewImpl()->setDefaultPageScaleLimits(0.25f, 5);
     }