Fix build of mini_installer with VS2012

chrome_frame/chrome_frame.gyp

 # Copyright (c) 2012 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,
 
     'variables': {
       'version_py_path': '../tools/build/version.py',
@@ skipping 844 matching lines @@
         'chrome_frame_launcher.gyp:chrome_launcher',
         'chrome_frame_launcher.gyp:chrome_frame_helper',
         'chrome_frame_launcher.gyp:chrome_frame_helper_dll',
         'locales/locales.gyp:*',
         '../build/temp_gyp/googleurl.gyp:googleurl',
         '../chrome/chrome.gyp:chrome',
         '../chrome/chrome.gyp:chrome_dll',
         '../chrome/chrome.gyp:chrome_version_resources',
         '../chrome/chrome.gyp:common',
       ],
+      'defines': [
+        '_WINDLL',
+      ],
       'sources': [
         'chrome_frame_elevation.rgs',
         'chrome_frame_reporting.cc',
         'chrome_frame_reporting.h',
         'chrome_tab.cc',
         'chrome_tab.def',
         '<(SHARED_INTERMEDIATE_DIR)/chrome_frame/chrome_tab.h',
         # FIXME(slightlyoff): For chrome_tab.tlb. Giant hack until we can
         #   figure out something more gyp-ish.
         'resources/tlb_resource.rc',
@@ skipping 175 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],
         },
       ],
     }, ],  # 'coverage!=0'
   ],  # 'conditions'
 }