run cygwin mount setup in runhooks, and remove some references to it

webkit/glue/webkit_glue.gypi

 # Copyright (c) 2012 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': {
     'conditions': [
       ['inside_chromium_build==0', {
         'webkit_src_dir': '../../../../..',
       },{
@@ skipping 500 matching lines @@
         ['OS!="win"', {
           'sources/': [['exclude', '_win\\.cc$']],
           'sources!': [
             'webthemeengine_impl_win.cc',
           ],
         }, {  # else: OS=="win"
           'sources/': [['exclude', '_posix\\.cc$']],
           'include_dirs': [
             '<(DEPTH)/third_party/wtl/include',
           ],
-          'dependencies': [
-            '<(DEPTH)/build/win/system.gyp:cygwin',
-          ],
           'sources!': [
             'plugins/plugin_stubs.cc',
           ],
           'conditions': [
             ['inside_chromium_build==1 and component=="shared_library"', {
               'dependencies': [
                 '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
                ],
                'export_dependent_settings': [
                  '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
@@ skipping 33 matching lines @@
               },
               'includes': [ '../../build/grit_action.gypi' ],
             },
           ],
           'includes': [ '../../build/grit_target.gypi' ],
         },
       ],
     }],
   ],
 }