[Experimental Framework] Move the trial token public key out of content and into the embedder.

chrome/chrome_common.gypi

 # Copyright (c) 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': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 44 matching lines @@
       'common/media/media_resource_provider.cc',
       'common/media/media_resource_provider.h',
       'common/media/webrtc_logging_message_data.cc',
       'common/media/webrtc_logging_message_data.h',
       'common/media/webrtc_logging_messages.h',
       'common/media_galleries/metadata_types.h',
       'common/multi_process_lock.h',
       'common/multi_process_lock_linux.cc',
       'common/multi_process_lock_mac.cc',
       'common/multi_process_lock_win.cc',
+      'common/origin_trials/origin_trial_key_manager.cc',
+      'common/origin_trials/origin_trial_key_manager.h',
       'common/partial_circular_buffer.cc',
       'common/partial_circular_buffer.h',
       'common/pref_names_util.cc',
       'common/pref_names_util.h',
       'common/prerender_types.h',
       'common/profiling.cc',
       'common/profiling.h',
       'common/ref_counted_util.h',
       'common/render_messages.cc',
       'common/render_messages.h',
@@ skipping 565 matching lines @@
       'sources': [
         'common/resource_usage_reporter.mojom',
       ],
       'dependencies': [
         '../mojo/mojo_base.gyp:mojo_environment_chromium',
         '../third_party/mojo/mojo_public.gyp:mojo_cpp_bindings',
       ],
     },
   ],
 }