Add target_arch config variable to .isolate files.

chrome/chrome.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': [
     ['OS=="linux"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/libffmpegsumo.so',
           '<(PRODUCT_DIR)/libosmesa.so',
@@ skipping 42 matching lines @@
           '<(PRODUCT_DIR)/<(mac_product_name).app/',
         ],
       },
     }],
     ['OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/<(version_full).manifest',
           '<(PRODUCT_DIR)/chrome.dll',
           '<(PRODUCT_DIR)/chrome_elf.dll',
-          '<(PRODUCT_DIR)/d3dcompiler_46.dll',
           '<(PRODUCT_DIR)/ffmpegsumo.dll',
-          '<(PRODUCT_DIR)/libEGL.dll',
           '<(PRODUCT_DIR)/libexif.dll',
-          '<(PRODUCT_DIR)/libGLESv2.dll',
           '<(PRODUCT_DIR)/nacl64<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/osmesa.dll',
           '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.dll',
         ],
       },
     }],
     ['OS=="win" and component=="static_library"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/chrome_child.dll',
         ],
       },
     }],
   ],
   'includes': [
-    '../base/base.isolate',
+    'angle.isolate',
   ],
 }