Make the dismiss button on the CF infobar be an image button.

chrome_frame/resources/chrome_frame_resources.grd

Index: chrome_frame/resources/chrome_frame_resources.grd
diff --git a/chrome_frame/resources/chrome_frame_resources.grd b/chrome_frame/resources/chrome_frame_resources.grd
index e9e1bc4122e2098cee165fbd343af7632a0f908f..8bc55841aa986158e000458cf456d4f17f8e5ee5 100644
--- a/chrome_frame/resources/chrome_frame_resources.grd
+++ b/chrome_frame/resources/chrome_frame_resources.grd
@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- 
+<!--
 Copyright (c) 2010 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.
 -->
 
 <!--
-Embeded strings, branding resource, etc. See chrome_frame_strings.grd 
+Embeded strings, branding resource, etc. See chrome_frame_strings.grd
 for localizable strings
 -->
 
@@ -39,6 +39,7 @@ for localizable strings
       <if expr="not pp_ifdef('_google_chrome')">
         <include name="IDI_CHROME_FRAME_ICON" file="../../chrome/app/theme/chromium/chromium.ico" type="ICON" />
       </if>
+      <include name="IDB_TURNDOWN_PROMPT_CLOSE_BUTTON" file="../../chrome/app/theme/default_100_percent/common/cf_close_strip.bmp" type="BITMAP" />
     </includes>
   </release>
 </grit>