Move Android user agent generation to native code

content/content_app.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.
 
 {
   'include_dirs': [
     '..',
   ],
   'dependencies': [
     '../base/base.gyp:base',
     '../base/base.gyp:base_i18n',
     '../crypto/crypto.gyp:crypto',
     '../ui/ui.gyp:ui',
   ],
   'sources': [
     'app/android/app_jni_registrar.cc',
     'app/android/app_jni_registrar.h',
     'app/android/content_main.cc',
     'app/android/content_main.h',
     'app/android/library_loader_hooks.cc',
     'app/android/sandboxed_process_service.cc',
     'app/android/sandboxed_process_service.h',
-    'app/android/user_agent.cc',
-    'app/android/user_agent.h',
     'app/content_main.cc',
     'app/content_main_runner.cc',
     'app/startup_helper_win.cc',
     'public/app/android_library_loader_hooks.h',
     'public/app/content_main.h',
     'public/app/content_main_delegate.cc',
     'public/app/content_main_delegate.h',
     'public/app/content_main_runner.h',
     'public/app/startup_helper_win.h',
   ],
@@ skipping 10 matching lines @@
       'include_dirs': [
         '<(SHARED_INTERMEDIATE_DIR)/content',
       ],
       'dependencies': [
         'content.gyp:content_jni_headers',
         '../skia/skia.gyp:skia',
       ],
     }],
   ],
 }