Add dependency back on sync_proto from sync_unit_tests.

chrome/chrome.gyp

 # Copyright (c) 2009 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,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
@@ skipping 6749 matching lines @@
             '_CRT_SECURE_NO_WARNINGS',
             '_USE_32BIT_TIME_T',
           ],
           'dependencies': [
             'common',
             'debugger',
             '../skia/skia.gyp:skia',
             '../testing/gtest.gyp:gtest',
             '../third_party/libjingle/libjingle.gyp:libjingle',
             'syncapi',
+            'sync_proto',
             'test_support_unit',
           ],
           'conditions': [
             ['OS=="win"', {
               'sources' : [
                 'browser/sync/util/data_encryption_unittest.cc',
               ],
               'dependencies': [
                 '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
               ],
@@ skipping 190 matching lines @@
       ],  # targets when browser_sync==1
     }],
   ],  # 'conditions'
 }
 
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