We do not pass enums by conts references. This CL fixes style errors introduced

content/port/browser/render_view_host_delegate_view.h

Index: content/port/browser/render_view_host_delegate_view.h
diff --git a/content/port/browser/render_view_host_delegate_view.h b/content/port/browser/render_view_host_delegate_view.h
index 678a449c4f37561f0bedb4afdf437174980d37e2..b59d6e02411fda0dd03669604d92f2a3539799e3 100644
--- a/content/port/browser/render_view_host_delegate_view.h
+++ b/content/port/browser/render_view_host_delegate_view.h
@@ -34,7 +34,7 @@ class CONTENT_EXPORT RenderViewHostDelegateView {
   // A context menu should be shown, to be built using the context information
   // provided in the supplied params.
   virtual void ShowContextMenu(const ContextMenuParams& params,
-                               const ContextMenuSourceType& type) {}
+                               ContextMenuSourceType type) {}
 
   // Shows a popup menu with the specified items.
   // This method should call RenderViewHost::DidSelectPopupMenuItem[s]() or