Replace most uses of asset_location with android_assets() template

content/content_unittests.isolate

 # Copyright (c) 2013 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.
 {
   'conditions': [
     ['use_x11==0', {
       'variables': {
         'command': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/content_unittests<(EXECUTABLE_SUFFIX)',
@@ skipping 25 matching lines @@
     }],
     ['OS=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'files': [
           '../net/data/ssl/certificates/',
           '../media/test/data/',
           'test/data/',
         ],
       },
     }],
-    ['OS=="android"', {
-      'variables': {
-        'files': [
-          '<(PRODUCT_DIR)/content_shell/assets/content_shell.pak',
-        ],
-      },
-    }],
-    ['OS=="linux" or OS=="mac" or OS=="win"', {
+    ['OS=="linux" or OS=="mac" or OS=="win" or OS=="android"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/content_shell.pak',
         ],
       },
     }],
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'files': [
           '../testing/test_env.py',
@@ skipping 36 matching lines @@
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
     '../gin/v8.isolate',
     '../ui/gl/gl.isolate',
   ],
 }