Force MimeHandlerView to always use BrowserPlugin

content/browser/frame_host/render_frame_host_manager.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 464 matching lines @@
   // given SiteInstance.  May return a routing ID of either a RenderFrameHost
   // (if opener's current or pending RFH has SiteInstance |instance|) or a
   // RenderFrameProxyHost.  Returns MSG_ROUTING_NONE if there is no opener, or
   // if the opener node doesn't have a proxy for |instance|.
   int GetOpenerRoutingID(SiteInstance* instance);
 
   // Called on the RFHM of the inner WebContents to create a
   // RenderFrameProxyHost in its outer WebContents's SiteInstance,
   // |outer_contents_site_instance|. The frame in outer WebContents that is
   // hosting the inner WebContents is |render_frame_host|, and the frame will
-  // be swapped out with the proxy.
+  // be swapped out with the proxy.Note that this method must only be called
+  // for an OOPIF-based inner WebContents.
   void CreateOuterDelegateProxy(SiteInstance* outer_contents_site_instance,
                                 RenderFrameHostImpl* render_frame_host);
 
   // Sets the child RenderWidgetHostView for this frame, which must be part of
   // an inner WebContents.
   void SetRWHViewForInnerContents(RenderWidgetHostView* child_rwhv);
 
   // Returns the number of RenderFrameProxyHosts for this frame.
   int GetProxyCount();
 
@@ skipping 318 matching lines @@
   std::unique_ptr<RenderFrameHostImpl> speculative_render_frame_host_;
 
   base::WeakPtrFactory<RenderFrameHostManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_