Stop linking in the old Mojo EDK.

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 2166 matching lines @@
       'target_name': 'test_support_unit',
       'type': 'static_library',
       'dependencies': [
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
         'browser',
         'common',
         'test_support_common',
         '../base/base.gyp:base',
         '../mojo/mojo_base.gyp:mojo_environment_chromium',
+        '../mojo/mojo_edk.gyp:mojo_system_impl',
         '../skia/skia.gyp:skia',
         '../sync/sync.gyp:sync',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
-        '../third_party/mojo/mojo_edk.gyp:mojo_system_impl',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'browser/sync/glue/session_sync_test_helper.cc',
         'browser/sync/glue/session_sync_test_helper.h',
         'test/base/run_all_unittests.cc',
       ],
       'conditions': [
@@ skipping 855 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }