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

chrome/app/google_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are specific to
 Google Chrome. These strings will be translated for each locale that Google
 Chrome supports. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/google_chrome_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 178 matching lines @@
           About Chrome Frame...
         </message>
         <message name="IDS_CHROME_FRAME_READY_MODE_LEARN_MORE_URL" desc="Link to knowledge-base article about Chrome Frame Ready Mode">
           http://www.google.com/support/chrome/bin/answer.py?hl=[GRITLANGCODE]&amp;answer=161796
         </message>
         <message name="IDS_CHROME_FRAME_TURNDOWN_LEARN_MORE_URL" desc="Link to knowledge-base article about Chrome Frame turndown">
           http://support.google.com/chrome/?p=ib_chromeframe
         </message>
         <message name="IDS_CHROME_FRAME_TURNDOWN_TEXT_IE_OLDER" desc="Text of Chrome Frame turndown prompt for IE 6, 7, and 8">
           This site is using the Chrome Frame plug-in which will soon be unsupported. Please uninstall it and upgrade to a modern browser.
-        </message>
+        </message>
         <message name="IDS_CHROME_FRAME_TURNDOWN_TEXT_IE_NEWER" desc="Text of Chrome Frame turndown prompt for IE 9 and 10">
           This site is using the Chrome Frame plug-in that will soon be unsupported. Please uninstall it and download a compatible browser.
-        </message>
+        </message>
         <message name="IDS_SHORTCUT_NEW_WINDOW" desc="The text label of the New window shortcut context menu entry as of Windows 8">
           New window
         </message>
       </if>
       <message name="IDS_CERT_ERROR_COMMON_NAME_INVALID_EXTRA_INFO_2" desc="2nd paragraph of extra information for an unsafe common name in an X509 certificate">
         In this case, the address listed in the certificate does not match the address of the website your browser tried to go to. One possible reason for this is that your communications are being intercepted by an attacker who is presenting a certificate for a different website, which would cause a mismatch. Another possible reason is that the server is set up to return the same certificate for multiple websites, including the one you are attempting to visit, even though that certificate is not valid for all of those websites. Google Chrome can say for sure that you reached &lt;strong&gt;<ph name="DOMAIN2">$1<ex>paypal.com</ex></ph>&lt;/strong&gt;, but cannot verify that that is the same site as &lt;strong&gt;<ph name="DOMAIN">$2<ex>www.paypal.com</ex></ph>&lt;/strong&gt; which you intended to reach. If you proceed, Chrome will not check for any further name mismatches.
       </message>
       <message name="IDS_CERT_ERROR_EXPIRED_DETAILS" desc="Details for an expired X509 certificate">
         You attempted to reach &lt;strong&gt;<ph name="DOMAIN">$1<ex>paypal.com</ex></ph>&lt;/strong&gt;, but the server presented an expired certificate. No information is available to indicate whether that certificate has been compromised since its expiration. This means Google Chrome cannot guarantee that you are communicating with &lt;strong&gt;<ph name="DOMAIN2">$2<ex>paypal.com</ex></ph>&lt;/strong&gt; and not an attacker. Your computer's clock is currently set to <ph name="CURRENT_TIME">$3<ex>Monday, July 18th, 2012 12:31PM</ex></ph>. Does that look right? If not, you should correct the error and refresh this page.
       </message>
@@ skipping 713 matching lines @@
         <message name="IDS_MESSAGE_CENTER_BALLOON_TITLE" desc="Title of the first run notification ballon describing the notification center.">
           Chrome Notification Center
         </message>
         <message name="IDS_MESSAGE_CENTER_BALLOON_TEXT" desc="Body text for the the first run notification ballon describing the notification center.">
           You can see all your notifications from Chrome apps, extensions, and websites here.
         </message>
       </if>
     </messages>
   </release>
 </grit>