Mojo-ify implementation of screen orientation locking/unlocking.

content/browser/frame_host/render_frame_host_delegate.cc

Index: content/browser/frame_host/render_frame_host_delegate.cc
diff --git a/content/browser/frame_host/render_frame_host_delegate.cc b/content/browser/frame_host/render_frame_host_delegate.cc
index 4dcd5811c4e9eaa6564e01e61eaae28c1abea117..dea9054c9f62dcdab0d878a0f4ffa116ccb3c0d4 100644
--- a/content/browser/frame_host/render_frame_host_delegate.cc
+++ b/content/browser/frame_host/render_frame_host_delegate.cc
@@ -77,6 +77,11 @@ RenderFrameHostDelegate::GetWakeLockServiceContext() {
   return nullptr;
 }
 
+ScreenOrientationProvider*
+RenderFrameHostDelegate::GetScreenOrientationProvider() {
+  return nullptr;
+}
+
 bool RenderFrameHostDelegate::ShouldRouteMessageEvent(
     RenderFrameHost* target_rfh,
     SiteInstance* source_site_instance) const {