Fix the remaining cases of classes implementing non-existent TabContentsDelegate::IsPopup().

chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc

 // Copyright (c) 2011 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/ui/gtk/tabs/dragged_tab_controller_gtk.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 205 matching lines @@
   }
 }
 
 void DraggedTabControllerGtk::LoadingStateChanged(TabContents* source) {
   // TODO(jhawkins): It would be nice to respond to this message by changing the
   // screen shot in the dragged tab.
   if (dragged_view_.get())
     dragged_view_->Update();
 }
 
-bool DraggedTabControllerGtk::IsPopup(const TabContents* source) const {
-  return false;
-}
-
 content::JavaScriptDialogCreator*
 DraggedTabControllerGtk::GetJavaScriptDialogCreator() {
   return GetJavaScriptDialogCreatorInstance();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DraggedTabControllerGtk, content::NotificationObserver implementation:
 
 void DraggedTabControllerGtk::Observe(
     int type,
@@ skipping 660 matching lines @@
 
 bool DraggedTabControllerGtk::AreTabsConsecutive() {
   for (size_t i = 1; i < drag_data_->size(); ++i) {
     if (drag_data_->get(i - 1)->source_model_index_ + 1 !=
         drag_data_->get(i)->source_model_index_) {
       return false;
     }
   }
   return true;
 }