content: Run perftests serially.

content/content_tests.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.
 
 {
   'targets': [
     {
       'target_name': 'test_support_content',
       'type': 'static_library',
       'dependencies': [
@@ skipping 812 matching lines @@
             '../skia/skia.gyp:skia',
             '../testing/gtest.gyp:gtest',
             '../testing/perf/perf_test.gyp:*',
             '../ui/gfx/gfx.gyp:gfx',
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             'common/cc_messages_perftest.cc',
-            'test/run_all_unittests.cc',
+            'test/run_all_perftests.cc',
           ],
         },
         {
           'target_name': 'content_browsertests',
           'type': '<(gtest_target_type)',
           'dependencies': [
             'content.gyp:content_common',
             'content.gyp:content_gpu',
             'content.gyp:content_plugin',
             'content.gyp:content_renderer',
@@ skipping 752 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }