Callback: De-inline CallbackBase, and move to callback_helpers -> callback_internal.h

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 24 matching lines @@
           'base_paths_win.h',
           'base_switches.cc',
           'base_switches.h',
           'basictypes.h',
           'bind.h',
           'bind_helpers.h',
           'bind_internal.h',
           'bits.h',
           'bzip2_error_handler.cc',
           'callback.h',
-          'callback_helpers.h',
+          'callback_internal.cc',
+          'callback_internal.h',
           'callback_old.h',
           'command_line.cc',
           'command_line.h',
           'compiler_specific.h',
           'cpu.cc',
           'cpu.h',
           'debug/debug_on_start_win.cc',
           'debug/debug_on_start_win.h',
           'debug/debugger.cc',
           'debug/debugger.h',
@@ skipping 683 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }