Force mini_installer to be optimized for size for the official builds.

chrome/installer/mini_installer.gypi

 # 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.
 {
   'dependencies': [
     '<@(chrome_dll_project)',
     '../chrome.gyp:chrome',
     '../chrome.gyp:chrome_nacl_win64',
     '../chrome.gyp:default_extensions',
     '../chrome.gyp:setup',
@@ skipping 205 matching lines @@
         #'--distribution=$(CHROMIUM_BUILD)',
         '--distribution=_google_chrome',
         # Optional arguments to generate diff installer
         #'--last_chrome_installer=C:/Temp/base',
         #'--setup_exe_format=DIFF',
         #'--diff_algorithm=COURGETTE',
       ],
       'message': 'Create installer archive',
     },
   ],
-  # TODO(mark):  <(branding_dir) should be defined by the
-  # global condition block at the bottom of the file, but
-  # this doesn't work due to the following issue:
-  #
-  #   http://code.google.com/p/gyp/issues/detail?id=22
-  #
-  # Remove this block once the above issue is fixed.
   'conditions': [
-    [ 'branding == "Chrome"', {
+    # TODO(mark):  <(branding_dir) should be defined by the
+    # global condition block at the bottom of the file, but
+    # this doesn't work due to the following issue:
+    #
+    #   http://code.google.com/p/gyp/issues/detail?id=22
+    #
+    # Remove this block once the above issue is fixed.
+    ['branding == "Chrome"', {
       'variables': {
          'branding_dir': '../app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': '../app/theme/chromium',
       },
     }],
+    ['OS=="win" and buildtype=="Official"', {
+      # Optimize for size when doing an official build.
+      'optimize' :'size',
+    }],
   ],
 }