Cleanup various WebView/WebFrame APIs to properly handle remote frames.

Source/web/RemoteFrameClient.h

Index: Source/web/RemoteFrameClient.h
diff --git a/Source/web/RemoteFrameClient.h b/Source/web/RemoteFrameClient.h
index 642bd66fc3a4545805c9883e391a47b7e87f3258..888a106073ded420be200c400c28ee791b0f621b 100644
--- a/Source/web/RemoteFrameClient.h
+++ b/Source/web/RemoteFrameClient.h
@@ -15,6 +15,7 @@ class RemoteFrameClient : public WebCore::FrameClient {
 public:
     explicit RemoteFrameClient(WebRemoteFrameImpl*);
 
+    // FrameClient overrides:
     virtual WebCore::Frame* opener() const OVERRIDE;
     virtual void setOpener(WebCore::Frame*) OVERRIDE;
 
@@ -25,6 +26,8 @@ public:
     virtual WebCore::Frame* firstChild() const OVERRIDE;
     virtual WebCore::Frame* lastChild() const OVERRIDE;
 
+    WebRemoteFrameImpl* webFrame() const { return m_webFrame; }
+
 private:
     WebRemoteFrameImpl* m_webFrame;
 };