Don't build the task manager into Android builds.

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 4031 matching lines @@
             'browser/ui/sync/one_click_signin_helper.cc',
             'browser/ui/sync/one_click_signin_helper.h',
             'browser/ui/sync/one_click_signin_histogram.h',
             'browser/ui/sync/one_click_signin_sync_starter.cc',
             'browser/ui/sync/one_click_signin_sync_starter.h',
             'browser/ui/views/one_click_signin_dialog_views.cc',
             'browser/ui/views/sync/one_click_signin_bubble_view.cc',
             'browser/ui/views/sync/one_click_signin_bubble_view.h',
           ]
         }],
+        ['enable_task_manager==0', {
+          'sources/': [
+            ['exclude', '^browser/task_manager/'],
+            ['exclude', '^browser/ui/webui/task_manager/'],
+          ],
+        }],
         ['disable_nacl==0', {
           'sources': [
             'browser/nacl_host/nacl_broker_host_win.cc',
             'browser/nacl_host/nacl_broker_host_win.h',
             'browser/nacl_host/nacl_broker_service_win.cc',
             'browser/nacl_host/nacl_broker_service_win.h',
             'browser/nacl_host/nacl_process_host.cc',
             'browser/nacl_host/nacl_process_host.h',
           ],
           'dependencies': [
@@ skipping 1194 matching lines @@
          'variables': {
           'proto_in_dir': '../third_party/cros_system_api/dbus/',
           'proto_out_dir': 'chrome/browser/chromeos/dbus',
          },
          'includes': ['../build/protoc.gypi'],
         }],
       ],
     },
   ],
 }