Move allowsBrokenNullLayerTreeView calls from WebViewClient to WebWidgetClient.

third_party/WebKit/public/web/WebViewClient.h

Index: third_party/WebKit/public/web/WebViewClient.h
diff --git a/third_party/WebKit/public/web/WebViewClient.h b/third_party/WebKit/public/web/WebViewClient.h
index f94f9e9a0f209185c336e233dfdce5937cdf1219..1fee5c15f7b5857b4bbf05ea578c18f27acfac98 100644
--- a/third_party/WebKit/public/web/WebViewClient.h
+++ b/third_party/WebKit/public/web/WebViewClient.h
@@ -250,7 +250,6 @@ public:
     // TODO(lfg): These methods are only exposed through WebViewClient while we
     // refactor WebView to not inherit from WebWidget.
     // WebWidgetClient overrides.
-    bool allowsBrokenNullLayerTreeView() const override { return false; }
     void closeWidgetSoon() override {}
     void convertViewportToWindow(WebRect* rect) override {}
     void convertWindowToViewport(WebFloatRect* rect) override {}
@@ -278,6 +277,7 @@ public:
     void show(WebNavigationPolicy) override {}
     WebRect windowRect() override { return WebRect(); }
     WebRect windowResizerRect() override { return WebRect(); }
+    virtual WebWidgetClient* widgetClient() { return this; }
 
 protected:
     ~WebViewClient() { }