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

chrome/browser/ui/views/tabs/browser_tab_strip_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_BROWSER_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_BROWSER_TAB_STRIP_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 53 matching lines @@
   virtual void UpdateLoadingAnimations() OVERRIDE;
   virtual int HasAvailableDragActions() const OVERRIDE;
   virtual void OnDropIndexUpdate(int index, bool drop_before) OVERRIDE;
   virtual void PerformDrop(bool drop_before,
                            int index,
                            const GURL& url) OVERRIDE;
   virtual bool IsCompatibleWith(TabStrip* other) const OVERRIDE;
   virtual void CreateNewTab() OVERRIDE;
   virtual bool IsIncognito() OVERRIDE;
   virtual void LayoutTypeMaybeChanged() OVERRIDE;
+  virtual bool IsTabShowingWebViewModalDialog(int index) OVERRIDE;
   virtual void OnStartedDraggingTabs() OVERRIDE;
   virtual void OnStoppedDraggingTabs() OVERRIDE;
 
   // TabStripModelObserver implementation:
   virtual void TabInsertedAt(content::WebContents* contents,
                              int model_index,
                              bool is_active) OVERRIDE;
   virtual void TabDetachedAt(content::WebContents* contents,
                              int model_index) OVERRIDE;
   virtual void TabSelectionChanged(
@@ skipping 71 matching lines @@
   // top-of-window views to be revealed when the user is dragging |tabstrip|'s
   // tabs.
   scoped_ptr<ImmersiveRevealedLock> immersive_reveal_lock_;
 
   PrefChangeRegistrar local_pref_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserTabStripController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_BROWSER_TAB_STRIP_CONTROLLER_H_