Provide downcasts for WebLocalFrameBase using DEFINE_TYPE_CASTS macro.

third_party/WebKit/Source/core/frame/WebLocalFrameBase.h

Index: third_party/WebKit/Source/core/frame/WebLocalFrameBase.h
diff --git a/third_party/WebKit/Source/core/frame/WebLocalFrameBase.h b/third_party/WebKit/Source/core/frame/WebLocalFrameBase.h
index 9679281158e46567848ed60dbc811134572cb6a1..340ad4ff12ca97d6ee82bb5c7efc3d1d2ba72b44 100644
--- a/third_party/WebKit/Source/core/frame/WebLocalFrameBase.h
+++ b/third_party/WebKit/Source/core/frame/WebLocalFrameBase.h
@@ -10,6 +10,7 @@
 
 namespace blink {
 
+class FrameView;
 class LocalFrame;
 class Node;
 class WebFrameClient;
@@ -34,10 +35,19 @@ class WebLocalFrameBase : public WebLocalFrame {
   virtual WebTextCheckClient* TextCheckClient() const = 0;
   virtual void SetContextMenuNode(Node*) = 0;
   virtual void ClearContextMenuNode() = 0;
+  virtual LocalFrame* GetFrame() const = 0;
+  virtual FrameView* GetFrameView() const = 0;
 
  protected:
   explicit WebLocalFrameBase(WebTreeScopeType scope) : WebLocalFrame(scope) {}
 };
-}
+
+DEFINE_TYPE_CASTS(WebLocalFrameBase,
+                  WebFrame,
+                  frame,
+                  frame->IsWebLocalFrame(),
+                  frame.IsWebLocalFrame());
+
+}  // namespace blink
 
 #endif  // WebLocalFrameBase_h