Exclude download_menu from Android builds.

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 3273 matching lines @@
             'browser/auto_launch_trial.cc',
             'browser/certificate_viewer.cc',
             'browser/chrome_browser_main_posix.cc',
             'browser/chrome_browser_main_posix.h',
             'browser/chrome_process_singleton.cc',
             'browser/component_updater/pnacl/pnacl_profile_observer.cc',
             'browser/component_updater/widevine_cdm_component_installer.cc',
             'browser/custom_home_pages_table_model.cc',
             'browser/download/download_danger_prompt.cc',
             'browser/download/download_shelf.cc',
+            'browser/download/download_shelf_context_menu.cc',
             'browser/drive/drive_switches.cc',
             'browser/external_protocol/external_protocol_observer.cc',
             'browser/feedback/proto/annotations.proto',
             'browser/feedback/proto/chrome.proto',
             'browser/feedback/proto/common.proto',
             'browser/feedback/proto/dom.proto',
             'browser/feedback/proto/math.proto',
             'browser/gpu/chrome_gpu_util.cc',
             'browser/idle_android.cc',
             'browser/idle.cc',
@@ skipping 413 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }