Convert the re2 GYP targets to be generated by GN.

chrome/chrome_browser_extensions.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': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 24 matching lines @@
         '../device/bluetooth/bluetooth.gyp:device_bluetooth',
         '../extensions/extensions.gyp:extensions_browser',
         '../net/net.gyp:net',
         '../skia/skia.gyp:skia',
         '../sync/sync.gyp:sync',
         '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
         '../third_party/libusb/libusb.gyp:libusb',
-        '../third_party/re2/re2.gyp:re2',
+        '../out/gn_gyp/third_party/re2/re2.gyp:re2',
         '../third_party/webrtc/modules/modules.gyp:desktop_capture',
         '../ui/base/strings/ui_strings.gyp:ui_strings',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/resources/ui_resources.gyp:ui_resources',
         '../ui/ui.gyp:ui',
         '../url/url.gyp:url_lib',
         '../webkit/common/user_agent/webkit_user_agent.gyp:user_agent',
         '../webkit/storage_browser.gyp:webkit_storage_browser',
         '../webkit/storage_common.gyp:webkit_storage_common',
         '../webkit/webkit_resources.gyp:webkit_resources',
@@ skipping 1158 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }