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 5298d583fbf05e20ce16fd645c95a1b08d261b03..a22a5bf05e9dca007b58aecf23ff4a73a8891e61 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -41,6 +41,7 @@ class FrameTreeNode;
 class InterstitialPage;
 class PageState;
 class RenderFrameHost;
+class ScreenOrientationProvider;
 class WebContents;
 struct AXEventNotificationDetails;
 struct AXLocationChangeNotificationDetails;
@@ -168,6 +169,9 @@ 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) {}