[Extensions] Fix bookmark drag-and-drop bug

chrome/browser/extensions/tab_helper.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.
 
 #include "chrome/browser/extensions/tab_helper.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 167 matching lines @@
   InvokeForContentRulesRegistries([this](ContentRulesRegistry* registry) {
     registry->MonitorWebContentsForRuleEvaluation(this->web_contents());
   });
 
   // We need an ExtensionWebContentsObserver, so make sure one exists (this is
   // a no-op if one already does).
   ChromeExtensionWebContentsObserver::CreateForWebContents(web_contents);
   ExtensionWebContentsObserver::GetForWebContents(web_contents)->dispatcher()->
       set_delegate(this);
 
-  BookmarkManagerPrivateDragEventRouter::MaybeCreateForWebContents(
-      web_contents);
+  BookmarkManagerPrivateDragEventRouter::CreateForWebContents(web_contents);
 
   registrar_.Add(this,
                  content::NOTIFICATION_LOAD_STOP,
                  content::Source<NavigationController>(
                      &web_contents->GetController()));
 }
 
 TabHelper::~TabHelper() {
   RemoveScriptExecutionObserver(ActivityLog::GetInstance(profile_));
 }
@@ skipping 479 matching lines @@
   }
 }
 
 void TabHelper::SetTabId(content::RenderFrameHost* render_frame_host) {
   render_frame_host->Send(
       new ExtensionMsg_SetTabId(render_frame_host->GetRoutingID(),
                                 SessionTabHelper::IdForTab(web_contents())));
 }
 
 }  // namespace extensions