separate about page into its own page (included in chrome://chrome)

chrome/browser/resources/options2/about_page.css

Index: chrome/browser/resources/options2/about_page.css
diff --git a/chrome/browser/resources/options2/about_page.css b/chrome/browser/resources/options2/about_page.css
deleted file mode 100644
index a64f9b89a535302381add57f0de364ed56e4d235..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/options2/about_page.css
+++ /dev/null
@@ -1,34 +0,0 @@
-#aboutPage {
-  -webkit-user-select: text;
-}
-
-.loading {
-  font-style: italic;
-}
-
-#channelSelect {
-  margin-bottom: 5px;
-}
-
-#channelWarning {
-  color: red;
-  font-weight: bold;
-}
-
-.update-icon {
-  width: 17px;
-  height: 17px;
-  display: inline-block;
-  vertical-align: middle;
-  background-repeat: no-repeat;
-}
-
-.update-icon.fail {
-  background-image: url('../../../app/theme/update_fail.png');
-}
-.update-icon.available {
-  background-image: url('../../../app/theme/update_available.png');
-}
-.update-icon.up-to-date {
-  background-image: url('../../../app/theme/update_uptodate.png');
-}