Provide downcasts for WebLocalFrameBase using DEFINE_TYPE_CASTS macro.

third_party/WebKit/Source/web/WebLocalFrameImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 302 matching lines @@
   base::SingleThreadTaskRunner* TimerTaskRunner() override;
   base::SingleThreadTaskRunner* LoadingTaskRunner() override;
   base::SingleThreadTaskRunner* UnthrottledTaskRunner() override;
   WebInputMethodControllerImpl* GetInputMethodController() const override;
 
   void ExtractSmartClipData(WebRect rect_in_viewport,
                             WebString& clip_text,
                             WebString& clip_html) override;
 
   void InitializeCoreFrame(Page&, FrameOwner*, const AtomicString& name);
-  LocalFrame* GetFrame() const { return frame_.Get(); }
+  LocalFrame* GetFrame() const override { return frame_.Get(); }
 
   void WillBeDetached();
   void WillDetachParent();
 
   static WebLocalFrameImpl* Create(WebTreeScopeType,
                                    WebFrameClient*,
                                    blink::InterfaceProvider*,
                                    blink::InterfaceRegistry*,
                                    WebFrame* opener);
   static WebLocalFrameImpl* CreateProvisional(WebFrameClient*,
@@ skipping 21 matching lines @@
 
   // If the frame hosts a PluginDocument, this method returns the
   // WebPluginContainerImpl that hosts the plugin. If the provided node is a
   // plugin, then it runs its WebPluginContainerImpl. Otherwise, uses the
   // currently focused element (if any).
   static WebPluginContainerImpl* CurrentPluginContainer(LocalFrame*,
                                                         Node* = nullptr);
 
   WebViewBase* ViewImpl() const override;
 
-  FrameView* GetFrameView() const {
+  FrameView* GetFrameView() const override {
     return GetFrame() ? GetFrame()->View() : 0;
   }
 
   WebDevToolsAgentImpl* DevToolsAgentImpl() const {
     return dev_tools_agent_.Get();
   }
 
   // Getters for the impls corresponding to Get(Provisional)DataSource. They
   // may return 0 if there is no corresponding data source.
   WebDataSourceImpl* DataSourceImpl() const;
@@ skipping 145 matching lines @@
 
 DEFINE_TYPE_CASTS(WebLocalFrameImpl,
                   WebFrame,
                   frame,
                   frame->IsWebLocalFrame(),
                   frame.IsWebLocalFrame());
 
 }  // namespace blink
 
 #endif