Fix silly mistake from r297715. The dlls should have been listed in the debug section.

base/base.isolate

 # Copyright 2014 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.
 {
   'includes': [
     # While the target 'base' doesn't depend on ../third_party/icu/icu.gyp
     # itself, virtually all targets using it has to include icu. The only
     # exception is the Windows sandbox (?).
     '../third_party/icu/icu.isolate',
   ],
   'conditions': [
     ['OS=="linux" and asan==1', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/lib/libc++.so',
         ],
       },
     }],
     ['OS=="win" and component=="shared_library" and CONFIGURATION_NAME=="Debug"', {
       'variables': {
         'files': [
           # Copy the VS runtime DLLs into the isolate so that they
           # don't have to be preinstalled on the target machine.
           '<(PRODUCT_DIR)/msvcp120d.dll',
           '<(PRODUCT_DIR)/msvcr120d.dll',
+          '<(PRODUCT_DIR)/x64/msvcp120.dll',
+          '<(PRODUCT_DIR)/x64/msvcr120.dll',
         ],
       },
     }],
     ['OS=="win" and component=="shared_library" and CONFIGURATION_NAME=="Release"', {
       'variables': {
         'files': [
           # Copy the VS runtime DLLs into the isolate so that they
           # don't have to be preinstalled on the target machine.
           '<(PRODUCT_DIR)/msvcp120.dll',
           '<(PRODUCT_DIR)/msvcr120.dll',
-          '<(PRODUCT_DIR)/x64/msvcp120.dll',
-          '<(PRODUCT_DIR)/x64/msvcr120.dll',
         ],
       },
     }],
   ],
 }