Make the empty browser_test work again after incremental linking broke it.

chrome/chrome_tests.gypi

 # Copyright (c) 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 2954 matching lines @@
         'renderer/print_web_view_helper_browsertest.cc',
         'renderer/safe_browsing/malware_dom_details_browsertest.cc',
         'renderer/safe_browsing/phishing_classifier_browsertest.cc',
         'renderer/safe_browsing/phishing_classifier_delegate_browsertest.cc',
         'renderer/safe_browsing/phishing_dom_feature_extractor_browsertest.cc',
         'renderer/safe_browsing/phishing_thumbnailer_browsertest.cc',
         'renderer/translate_helper_browsertest.cc',
         'test/automation/dom_automation_browsertest.cc',
         'test/base/layout_test_http_server.cc',
         'test/base/layout_test_http_server.h',
+        'test/base/empty_browser_test.cc',
         'test/base/in_process_browser_test_browsertest.cc',
         'test/base/chrome_render_view_test.cc',
         'test/base/chrome_render_view_test.h',
         'test/base/chrome_test_launcher.cc',
         'test/data/webui/assertions.js',
         'test/data/webui/async_gen.cc',
         'test/data/webui/async_gen.h',
         'test/data/webui/async_gen.js',
         'test/data/webui/certificate_viewer_dialog_test.js',
         'test/data/webui/certificate_viewer_ui_test-inl.h',
@@ skipping 1666 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'
 }