Properly route screen orientation IPC messages.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 40228dbfa968e966ae65c62789f0dbd5fc7b043b..40e0fe4d40d73fe06b7505bf49558e9680ef5dd8 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -57,6 +57,7 @@ class RenderViewHostDelegateView;
 class RenderViewHostImpl;
 class RenderWidgetHostImpl;
 class SavePackage;
+class ScreenOrientationDispatcherHost;
 class SiteInstance;
 class TestWebContents;
 class WebContentsDelegate;
@@ -1134,6 +1135,9 @@ class CONTENT_EXPORT WebContentsImpl
 
   scoped_ptr<MidiDispatcherHost> midi_dispatcher_host_;
 
+  scoped_ptr<ScreenOrientationDispatcherHost>
+      screen_orientation_dispatcher_host_;
+
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };