Android WebView: don't define sincos.

base/base.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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 742 matching lines @@
               ['include', '^sys_info_linux\\.cc$'],
               ['include', '^worker_pool_linux\\.cc$'],
             ],
           }],
           ['OS == "android" and _toolset == "host" and host_os == "linux"', {
             'sources/': [
               # Pull in specific files for host builds.
               ['include', '^threading/platform_thread_linux\\.cc$'],
             ],
           }],
+          ['OS == "android" and <(android_webview_build)==1', {
+            'defines': [
+               # WebView builds as part of the system which already has sincos;
+               # avoid defining it again as it causes a linker warning.
+               'ANDROID_SINCOS_PROVIDED',
+            ],
+          }],
           ['OS == "ios" and _toolset != "host"', {
             'sources/': [
               # Pull in specific Mac files for iOS (which have been filtered out
               # by file name rules).
               ['include', '^atomicops_internals_mac\\.'],
               ['include', '^base_paths_mac\\.'],
               ['include', '^file_util_mac\\.'],
               ['include', '^file_version_info_mac\\.'],
               ['include', '^mac/bundle_locations\\.'],
               ['include', '^mac/foundation_util\\.'],
@@ skipping 115 matching lines @@
           ['<(use_system_nspr)==1 and >(nacl_untrusted_build)==0', {
             'sources/': [
               ['exclude', '^third_party/nspr/'],
             ],
           }],
         ],
       }],
     ],
   },
 }