[iOS] ios/web no longer depends on content::BrowserThread.

ios/web/ios_web_shell.gyp

 # Copyright 2014 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': {
     'chromium_code': 1,
    },
   'targets': [
     {
       'target_name': 'ios_web_shell',
       'type': 'executable',
       'mac_bundle': 1,
       'include_dirs': [
         '../..',
       ],
       'dependencies': [
         'ios_web.gyp:ios_web',
         'ios_web.gyp:ios_web_app',
         '../../base/base.gyp:base',
         '../../net/net.gyp:net',
+        '../../net/net.gyp:net_extras',
         '../../ui/base/ui_base.gyp:ui_base',
       ],
       'xcode_settings': {
         'INFOPLIST_FILE': 'shell/Info.plist',
         'OTHER_LDFLAGS': [
           '-Xlinker -objc_abi_version -Xlinker 2'
         ]
       },
       'sources': [
         'shell/app_delegate.h',
@@ skipping 25 matching lines @@
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/CoreGraphics.framework',
           '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
           '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
         ],
       },
     },
   ],
 }