Add TestExtensionsBrowserClient, move ProcessManagerTest to //extensions

extensions/extensions.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 257 matching lines @@
       'type': 'static_library',
       'dependencies': [
         'extensions_browser',
         'extensions_common',
         '../base/base.gyp:base',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        'browser/test_extensions_browser_client.cc',
+        'browser/test_extensions_browser_client.h',
         'browser/test_management_policy.cc',
         'browser/test_management_policy.h',
         'common/extension_builder.cc',
         'common/extension_builder.h',
         'common/test_util.cc',
         'common/test_util.h',
         'common/value_builder.cc',
         'common/value_builder.h',
       ],
       # Disable c4267 warnings until we fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ]
 }