Revert of Require WebLocalFrame to be created with a non-null client

extensions/renderer/scoped_web_frame.h

Index: extensions/renderer/scoped_web_frame.h
diff --git a/extensions/renderer/scoped_web_frame.h b/extensions/renderer/scoped_web_frame.h
index ebcc877994f7a471df363bbcfd47349c8586f5e2..948a289483bf174fdb6369ccd194577865835f4e 100644
--- a/extensions/renderer/scoped_web_frame.h
+++ b/extensions/renderer/scoped_web_frame.h
@@ -6,7 +6,6 @@
 #define SCOPED_WEB_FRAME_H_
 
 #include "base/macros.h"
-#include "third_party/WebKit/public/web/WebFrameClient.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
@@ -22,15 +21,12 @@
   blink::WebLocalFrame* frame() { return frame_; }
 
 private:
- blink::WebFrameClient frame_client_;
-
- // The webview and the frame are kept alive by the ScopedWebFrame
- // because they are not destructed unless ~ScopedWebFrame explicitly
- // closes the WebView.
- blink::WebView* view_;
- blink::WebLocalFrame* frame_;
-
- DISALLOW_COPY_AND_ASSIGN(ScopedWebFrame);
+  // The webview and the frame are kept alive by the ScopedWebFrame
+  // because they are not destructed unless ~ScopedWebFrame explicitly
+  // closes the webview and the frame.
+  blink::WebView* view_;
+  blink::WebLocalFrame* frame_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedWebFrame);
 };
 
 }  // namespace extensions