MimeHandlerViewGuest: Ignore title changes due to navigations.

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc

 // Copyright 2014 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.
 
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
 
 #include "base/strings/stringprintf.h"
 #include "components/guest_view/common/guest_view_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/host_zoom_map.h"
@@ skipping 151 matching lines @@
   return embedder_web_contents()->GetDelegate()->OpenURLFromTab(
       embedder_web_contents(), params);
 }
 
 void MimeHandlerViewGuest::NavigationStateChanged(
     WebContents* source,
     content::InvalidateTypes changed_flags) {
   if (!(changed_flags & content::INVALIDATE_TYPE_TITLE))
     return;
 
+  // Only consider title changes not triggered by URL changes. Otherwise, the
+  // URL of the mime handler will be displayed.
+  if (changed_flags & content::INVALIDATE_TYPE_URL)
+    return;
+
   if (!is_full_page_plugin())
     return;
 
   content::NavigationEntry* last_committed_entry =
       embedder_web_contents()->GetController().GetLastCommittedEntry();
   if (last_committed_entry) {
     last_committed_entry->SetTitle(source->GetTitle());
     embedder_web_contents()->GetDelegate()->NavigationStateChanged(
         embedder_web_contents(), changed_flags);
   }
@@ skipping 43 matching lines @@
           element_instance_id()));
 }
 
 base::WeakPtr<StreamContainer> MimeHandlerViewGuest::GetStream() const {
   if (!stream_)
     return base::WeakPtr<StreamContainer>();
   return stream_->GetWeakPtr();
 }
 
 }  // namespace extensions