Move android filename rules to appropriate gypi file

build/filename_rules.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.
 
 # This gypi file defines the patterns used for determining whether a
 # file is excluded from the build on a given platform.  It is
 # included by common.gypi for chromium_code.
 
 {
   'target_conditions': [
@@ skipping 17 matching lines @@
     # shared at this point.
     # In case a file is not needed, it is going to be excluded later on.
     # TODO(evan): the above is not correct; we shouldn't build _linux
     # files on non-linux.
     ['OS!="linux" and OS!="openbsd" and OS!="freebsd" or >(nacl_untrusted_build)==1', {
       'sources/': [
         ['exclude', '_linux(_unittest)?\\.(h|cc)$'],
         ['exclude', '(^|/)linux/'],
       ],
     }],
-    ['OS!="android"', {
+    ['OS!="android" or _toolset=="host"', {
       'sources/': [
         ['exclude', '_android(_unittest)?\\.cc$'],
         ['exclude', '(^|/)android/'],
       ],
     }],
     ['OS=="win" and >(nacl_untrusted_build)==0', {
       'sources/': [
         ['exclude', '_posix(_unittest)?\\.(h|cc)$'],
         ['exclude', '(^|/)posix/'],
       ],
@@ skipping 47 matching lines @@
                     ['exclude', '(^|/)ash/'],
       ]
     }],
     ['<(use_ozone)==0 or >(nacl_untrusted_build)==1', {
       'sources/': [ ['exclude', '_ozone(_browsertest|_unittest)?\\.(h|cc)$'],
                     ['exclude', '(^|/)ozone/'],
       ]
     }],
   ]
 }