content should be referring to the blink_test_plugin.gyp in the public directory.

chrome/chrome_tests.gypi

 # Copyright 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 3280 matching lines @@
       ],
     }],
     ['test_isolation_mode != "noop"', {
       'targets': [
         {
           'target_name': 'browser_tests_run',
           'type': 'none',
           'dependencies': [
             'browser_tests',
             'chrome',
-            '../third_party/WebKit/Tools/DumpRenderTree/DumpRenderTree.gyp/DumpRenderTree.gyp:copy_TestNetscapePlugIn',
+            '../third_party/WebKit/public/blink_test_plugin.gyp:blink_test_plugin',
           ],
           'includes': [
             '../build/isolate.gypi',
             'browser_tests.isolate',
           ],
           'sources': [
             'browser_tests.isolate',
           ],
         },
         {
@@ skipping 85 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }