<webview>: Remove broken captureVisibleRegion code until feature is properly supported

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index 22de69280b863e8b37c24cf9fa5ba093fd133d28..d072e7b0d6f2f114f0e8acdf02544c6b2d01b3dd 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -172,10 +172,6 @@ class CONTENT_EXPORT BrowserPlugin :
   void OnAdvanceFocus(int instance_id, bool reverse);
   void OnAttachACK(int browser_plugin_instance_id);
   void OnCompositorFrameSwapped(const IPC::Message& message);
-  void OnCopyFromCompositingSurface(int instance_id,
-                                    int request_id,
-                                    gfx::Rect source_rect,
-                                    gfx::Size dest_size);
   void OnGuestGone(int instance_id);
   void OnSetContentsOpaque(int instance_id, bool opaque);
   void OnSetCursor(int instance_id, const WebCursor& cursor);