[Sync] Prevent uploading throttled datatypes.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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.
 {
   'target_defaults': {
     'conditions': [
       ['strip_tests==1', {
         'cflags!': [ '-g' ],
         'ldflags': [ '-Wl,--strip-debug' ],
       }],
@@ skipping 3291 matching lines @@
         'browser/sync/notifier/invalidation_notifier_unittest.cc',
         'browser/sync/notifier/non_blocking_invalidation_notifier_unittest.cc',
         'browser/sync/notifier/p2p_notifier_unittest.cc',
         'browser/sync/notifier/registration_manager_unittest.cc',
         'browser/sync/profile_sync_factory_mock.h',
         'browser/sync/protocol/proto_enum_conversions_unittest.cc',
         'browser/sync/protocol/proto_value_conversions_unittest.cc',
         'browser/sync/sessions/ordered_commit_set_unittest.cc',
         'browser/sync/sessions/session_state_unittest.cc',
         'browser/sync/sessions/status_controller_unittest.cc',
+        'browser/sync/sessions/sync_session_context_unittest.cc',
         'browser/sync/sessions/sync_session_unittest.cc',
         'browser/sync/sessions/test_util.cc',
         'browser/sync/sessions/test_util.h',
         'browser/sync/sync_js_controller_unittest.cc',
         'browser/sync/syncable/directory_backing_store_unittest.cc',
         'browser/sync/syncable/model_type_payload_map_unittest.cc',
         'browser/sync/syncable/model_type_unittest.cc',
         'browser/sync/syncable/syncable_enum_conversions_unittest.cc',
         'browser/sync/syncable/syncable_id_unittest.cc',
         'browser/sync/syncable/syncable_unittest.cc',
@@ skipping 1018 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }