Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

chrome/browser/gtk/tabs/tab_gtk.cc

 // Copyright (c) 2010 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/gtk/tabs/tab_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include "app/gtk_dnd_util.h"
 #include "app/menus/accelerator_gtk.h"
@@ skipping 51 matching lines @@
         tab_);
   }
   virtual bool GetAcceleratorForCommandId(
       int command_id,
       menus::Accelerator* accelerator) {
     int browser_command;
     if (!TabStripModel::ContextMenuCommandToBrowserCommand(command_id,
                                                            &browser_command))
       return false;
     const menus::AcceleratorGtk* accelerator_gtk =
-        Singleton<AcceleratorsGtk>()->GetPrimaryAcceleratorForCommand(
+        AcceleratorsGtk::GetInstance()->GetPrimaryAcceleratorForCommand(
             browser_command);
     if (accelerator_gtk)
       *accelerator = *accelerator_gtk;
     return !!accelerator_gtk;
   }
 
   virtual void ExecuteCommand(int command_id) {
     if (!tab_)
       return;
     tab_->delegate()->ExecuteCommandForTab(
@@ skipping 305 matching lines @@
     gdk_event_free(last_mouse_down_);
     last_mouse_down_ = NULL;
   }
 
   // Notify the drag helper that we're done with any potential drag operations.
   // Clean up the drag helper, which is re-created on the next mouse press.
   delegate_->EndDrag(canceled);
 
   observer_.reset();
 }