Mojo-ify implementation of screen orientation locking/unlocking.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index b251094322fdef9e1706263456d39266b38532d8..4c490e1c616b2d395a31245160968818e34faecc 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -42,6 +42,7 @@ class InterstitialPage;
 class PageState;
 class RenderFrameHost;
 class WebContents;
+class ScreenOrientationProvider;
 struct AXEventNotificationDetails;
 struct AXLocationChangeNotificationDetails;
 struct ContextMenuParams;
@@ -170,6 +171,9 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // Gets the WakeLockServiceContext associated with this delegate.
   virtual device::WakeLockServiceContext* GetWakeLockServiceContext();
 
+  // Gets the ScreenOrientationProvider associated with this delegate.
+  virtual ScreenOrientationProvider* GetScreenOrientationProvider();
+
   // Notification that the frame wants to go into fullscreen mode.
   // |origin| represents the origin of the frame that requests fullscreen.
   virtual void EnterFullscreenMode(const GURL& origin) {}