[temporary M30 fix] Disable dragging tabs with web contents modal dialogs displayed

chrome/browser/ui/views/tabs/fake_base_tab_strip_controller.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/ui/views/tabs/fake_base_tab_strip_controller.h"
 
 #include "chrome/browser/ui/views/tabs/tab_renderer_data.h"
 #include "chrome/browser/ui/views/tabs/tab_strip.h"
 
 FakeBaseTabStripController::FakeBaseTabStripController()
@@ skipping 97 matching lines @@
 void FakeBaseTabStripController::CreateNewTab() {
 }
 
 bool FakeBaseTabStripController::IsIncognito() {
   return false;
 }
 
 void FakeBaseTabStripController::LayoutTypeMaybeChanged() {
 }
 
+bool FakeBaseTabStripController::IsTabShowingWebViewModalDialog(int index) {
+  return false;
+}
+
 void FakeBaseTabStripController::OnStartedDraggingTabs() {
 }
 
 void FakeBaseTabStripController::OnStoppedDraggingTabs() {
 }