Ported cdb copying from GYP to GN.

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': {
     'build_angle_deqp_tests%': 0,
     'chrome_browser_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
@@ skipping 3276 matching lines @@
             '../content/content_shell_and_tests.gyp:telemetry_base',
           ],
           'conditions': [
             ['OS=="linux" or OS=="mac"', {
               'dependencies': [
                 '../breakpad/breakpad.gyp:dump_syms#host',
               ],
             }],
             ['OS=="mac" or OS=="win"', {
               'dependencies': [
-                # TODO(kbr): port this dependency to GN.
                 '../third_party/crashpad/crashpad/tools/tools.gyp:crashpad_database_util',
               ],
             }],
             ['OS=="win"', {
               'dependencies': [
-                # TODO(kbr): port this dependency to GN.
                 'copy_cdb_to_output',
               ],
             }],
           ],
         },
         {
           'target_name': 'gpu_tests_base',
           'type': 'none',
           'dependencies': [
             # depend on icu to fix races. http://crbug.com/417583
@@ skipping 142 matching lines @@
           ],
           'sources': [
             'sync_integration_tests.isolate',
           ],
         },
       ],
       'conditions': [
         ['OS=="win"', {
           'targets': [
             {
-              # TODO(kbr): port this target to GN.
               'target_name': 'copy_cdb_to_output',
               'type': 'none',
               'actions': [
                 {
                   'action_name': 'copy_cdb',
                   'inputs': [
                     '<(DEPTH)/build/win/copy_cdb_to_output.py',
                   ],
                   'outputs': [
                     '<(PRODUCT_DIR)/cdb/cdb.exe',
@@ skipping 136 matching lines @@
             'browser',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
           ],
         }]
     }],
   ],  # 'conditions'
 }