Quota: Factor out (Mock)QuotaManagerProxy into its own file for readability

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 262 matching lines @@
         'test/logging/win/mof_data_parser.cc',
         'test/logging/win/mof_data_parser.h',
         'test/logging/win/test_log_collector.cc',
         'test/logging/win/test_log_collector.h',
         'test/ppapi/ppapi_test.cc',
         'test/ppapi/ppapi_test.h',
         '../ui/gfx/image/image_unittest_util.cc',
         '../ui/gfx/image/image_unittest_util.h',
         '../webkit/browser/quota/mock_quota_manager.cc',
         '../webkit/browser/quota/mock_quota_manager.h',
+        '../webkit/browser/quota/mock_quota_manager_proxy.cc',
+        '../webkit/browser/quota/mock_quota_manager_proxy.h',
         '../webkit/browser/quota/mock_special_storage_policy.cc',
         '../webkit/browser/quota/mock_special_storage_policy.h',
       ],
       'conditions': [
         ['OS!="ios"', {
           'dependencies': [
             'common/extensions/api/api.gyp:api',
             'plugin',
             'renderer',
             'utility',
@@ skipping 2591 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }