Revise about: and chrome: url handling.

chrome/browser/net/url_fixer_upper.h

Index: chrome/browser/net/url_fixer_upper.h
diff --git a/chrome/browser/net/url_fixer_upper.h b/chrome/browser/net/url_fixer_upper.h
index e6096bb4cf9569445e3e20060b5df92a83e7e2e5..9e2b4e9eb941ed2b5dc6f10eb9be06552c8013ef 100644
--- a/chrome/browser/net/url_fixer_upper.h
+++ b/chrome/browser/net/url_fixer_upper.h
@@ -49,6 +49,14 @@ namespace URLFixerUpper {
   // instead of ".com").
   GURL FixupURL(const std::string& text, const std::string& desired_tld);
 
+  // Given |url| like about:foo, about://foo, chrome:foo, and chrome://foo, this
+  // returns the 'normalized' chrome://foo version of the URL. This chrome URL
+  // fixup probably shouldn't be performed in FixupURL, as that would break any
+  // extensions that perform URL overrides on the other chrome URL formats.
+  // Additionally, if the URL does not have a valid host, as in "about:", the
+  // returned URL will point to the host "version", as in "chrome://version".
+  GURL FixupChromeURL(const GURL& url);
+
   // Converts |text| to a fixed-up URL, allowing it to be a relative path on
   // the local filesystem.  Begin searching in |base_dir|; if empty, use the
   // current working directory.  If this resolves to a file on disk, convert it