Don't send the oncompleted signal twice in the webnavigation API

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

 // Copyright (c) 2012 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.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 429 matching lines @@
     SendErrorEvents(
         web_contents(), render_view_host_, FrameNavigationState::FrameID());
     render_view_host_ = pending_render_view_host_;
     pending_render_view_host_ = NULL;
   }
 
   // Update the URL as it might have changed.
   navigation_state_.UpdateFrame(frame_id, url);
   navigation_state_.SetNavigationCommitted(frame_id);
 
-  if (is_reference_fragment_navigation || is_history_state_modification)
-    navigation_state_.SetNavigationCompleted(frame_id);
-
   if (!navigation_state_.CanSendEvents(frame_id))
     return;
 
   if (is_reference_fragment_navigation) {
     helpers::DispatchOnCommitted(
         web_navigation::OnReferenceFragmentUpdated::kEventName,
         web_contents(),
         frame_num,
         is_main_frame,
         navigation_state_.GetUrl(frame_id),
@@ skipping 395 matching lines @@
 }
 
 void WebNavigationAPI::OnListenerAdded(const EventListenerInfo& details) {
   web_navigation_event_router_.reset(new WebNavigationEventRouter(profile_));
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
 #endif  // OS_ANDROID
 
 }  // namespace extensions