Convert the re2 GYP targets to be generated by GN.

components/plugins.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.
 
 {
   'conditions': [
     ['OS != "ios"', {
   
       'targets': [
         {
           'target_name': 'plugins_renderer',
           'type': 'static_library',
           'dependencies': [
             '../skia/skia.gyp:skia',
-            '../third_party/re2/re2.gyp:re2',
+            '../out/gn_gyp/third_party/re2/re2.gyp:re2',
             '../third_party/WebKit/public/blink.gyp:blink',
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             'plugins/renderer/plugin_placeholder.cc',
             'plugins/renderer/plugin_placeholder.h',
             'plugins/renderer/webview_plugin.cc',
             'plugins/renderer/webview_plugin.h',
           ],
           'conditions' : [
             ['OS=="android"', {
               'sources': [
                 'plugins/renderer/mobile_youtube_plugin.cc',
                 'plugins/renderer/mobile_youtube_plugin.h',
               ]
             }],
           ],
         },
       ]
     }]
   ]
 }