Fail if an isolate entry refers to a missing file.

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 43 matching lines @@
       },
     }],
     ['OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/<(version_full).manifest',
           '<(PRODUCT_DIR)/chrome.dll',
           '<(PRODUCT_DIR)/chrome_elf.dll',
           '<(PRODUCT_DIR)/ffmpegsumo.dll',
           '<(PRODUCT_DIR)/libexif.dll',
-          '<(PRODUCT_DIR)/nacl64<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/osmesa.dll',
         ],
       },
     }],
+    ['OS=="win" and target_arch=="ia32"', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/nacl64.exe',

[M-A Ruel, 2014/09/18 15:38:52]

You mean 32?

[jam, 2014/09/18 15:44:44]

nacl64.exe is needed with 32 bit builds of Chrome when they're run on a 64 bit
version of Windows. For 64-bit versions of Chrome, no such binary is needed

+        ],
+      },
+    }],
     ['OS=="win" and component=="static_library"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/chrome_child.dll',
         ],
       },
     }],
   ],
   'includes': [
     'angle.isolate',
   ],
 }