Consolidate manifest handler registration.

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 1547 matching lines @@
         'common/extensions/command_unittest.cc',
         'common/extensions/csp_validator_unittest.cc',
         'common/extensions/extension_constants_unittest.cc',
         'common/extensions/extension_file_util_unittest.cc',
         'common/extensions/extension_icon_set_unittest.cc',
         'common/extensions/extension_l10n_util_unittest.cc',
         'common/extensions/extension_localization_peer_unittest.cc',
         'common/extensions/extension_set_unittest.cc',
         'common/extensions/extension_sync_type_unittest.cc',
         'common/extensions/extension_unittest.cc',
-        'common/extensions/extension_unittest.h',
         'common/extensions/feature_switch_unittest.cc',
         'common/extensions/features/base_feature_provider_unittest.cc',
         'common/extensions/features/complex_feature_unittest.cc',
         'common/extensions/features/simple_feature_unittest.cc',
         'common/extensions/manifest_handlers/content_scripts_manifest_unittest.cc',
         'common/extensions/manifest_handlers/exclude_matches_manifest_unittest.cc',
         'common/extensions/manifest_handlers/externally_connectable_unittest.cc',
         'common/extensions/manifest_handlers/shared_module_manifest_unittest.cc',
         'common/extensions/manifest_tests/extension_manifest_test.cc',
         'common/extensions/manifest_tests/extension_manifests_background_unittest.cc',
@@ skipping 902 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }