Move the thread hop for UMA user actions from content:: to base::.

components/metrics.gypi

 # Copyright 2014 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': [
     {
       # GN version: //components/metrics
       'target_name': 'metrics',
       'type': 'static_library',
@@ skipping 169 matching lines @@
     {
       # TODO(isherman): Remove all //chrome dependencies on this target, and
       # merge the files in this target with components_unittests.
       # GN version: //components/metrics:test_support
       'target_name': 'metrics_test_support',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
+        '../base/base.gyp:test_support_base',
         'component_metrics_proto',
         'metrics',
       ],
       'export_dependent_settings': [
         'component_metrics_proto',
       ],
       'sources': [
         'metrics/test_metrics_provider.cc',
         'metrics/test_metrics_provider.h',
         'metrics/test_metrics_service_client.cc',
@@ skipping 128 matching lines @@
           ],
           'sources': [
             'metrics/profiler/ios/ios_tracking_synchronizer_delegate.cc',
             'metrics/profiler/ios/ios_tracking_synchronizer_delegate.h',
           ],
         },
       ],
     }],
   ],
 }