Create Mojo service for locking/unlocking screen orientation.

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 f8f0d8bd8ceca25cccf77cee7703a6ecb4d68024..65e1de7fb6479feb15c7b9231362099e0ea38d4b 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -61,7 +61,7 @@ class RenderViewHostDelegateView;
 class RenderViewHostImpl;
 class RenderWidgetHostImpl;
 class SavePackage;
-class ScreenOrientationDispatcherHost;
+class ScreenOrientationContext;
 class SiteInstance;
 class TestWebContents;
 class WebContentsDelegate;
@@ -175,8 +175,8 @@ class CONTENT_EXPORT WebContentsImpl
     return geolocation_dispatcher_host_.get();
   }
 
-  ScreenOrientationDispatcherHost* screen_orientation_dispatcher_host() {
-    return screen_orientation_dispatcher_host_.get();
+  ScreenOrientationContext* screen_orientation_context() {
+    return screen_orientation_context_.get();
   }
 
   bool should_normally_be_visible() { return should_normally_be_visible_; }
@@ -1227,8 +1227,7 @@ class CONTENT_EXPORT WebContentsImpl
 
   scoped_ptr<MidiDispatcherHost> midi_dispatcher_host_;
 
-  scoped_ptr<ScreenOrientationDispatcherHost>
-      screen_orientation_dispatcher_host_;
+  scoped_ptr<ScreenOrientationContext> screen_orientation_context_;
 
   // The accessibility mode for all frames. This is queried when each frame
   // is created, and broadcast to all frames when it changes.