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

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 0dca75e601de5d99f73f78391a426aaea3987649..6f29ae6c0ab7306f1596dc1cbab2f9623d8137ee 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -406,7 +406,7 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // 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) {}
 
   // The render view has requested access to media devices listed in
   // |request|, and the client should grant or deny that permission by