Add UMA stats to record when DLLs are successfully blocked in the Browser.

chrome_elf/chrome_elf.gyp

 # Copyright 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.
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/util/version.gypi',
     '../build/win_precompile.gypi',
     'blacklist.gypi',
+    'dll_hash.gypi',
   ],
   'targets': [
     {
       'target_name': 'chrome_elf',
       'type': 'shared_library',
       'include_dirs': [
         '..',
       ],
       'sources': [
         'chrome_elf.def',
@@ skipping 142 matching lines @@
               # Set /SUBSYSTEM:WINDOWS.
               'SubSystem': '2',
             },
           },
         },
       ],
     }],
   ],
 }