Add remaining trivial targets for the Linux GN build

chrome/test/perf/perf_test.gyp

 # 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.
 {
   'targets': [
     {
-      # GN version: //chrome/test/perf
+      # GN version: //chrome/test:perf
       'target_name': 'chrome_perf_test',
       'type': 'static_library',
       'sources': [
         'perf_test.cc',
       ],
       'dependencies': [
         '../../../base/base.gyp:base',
         '../../../testing/perf/perf_test.gyp:*',
       ],
     },
   ],
 }