Use chrome_html structure for shared_resources and options2 page.

chrome/browser/resources/help/help.css

Index: chrome/browser/resources/help/help.css
diff --git a/chrome/browser/resources/help/help.css b/chrome/browser/resources/help/help.css
index 6bb968d8f9c09a0be940ec79e5e9c5365652c2de..8ee1966d5a292e6bd3ec2be30f6dea5199e6303d 100644
--- a/chrome/browser/resources/help/help.css
+++ b/chrome/browser/resources/help/help.css
@@ -62,10 +62,12 @@ body {
 
 #update-status-icon.available {
   background-image: url('chrome://theme/IDR_UPDATE_AVAILABLE');
+  background-size: 17px;
 }
 
 #update-status-icon.up-to-date {
   background-image: url('chrome://theme/IDR_UPDATE_UPTODATE');
+  background-size: 17px;
 }
 
 #update-status-icon.working {
@@ -74,6 +76,7 @@ body {
 
 #update-status-icon.failed {
   background-image: url('chrome://theme/IDR_UPDATE_FAIL');
+  background-size: 17px;
 }
 
 #more-info-expander {