Revise about: and chrome: url handling.

chrome/browser/net/url_fixer_upper.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_URL_FIXER_UPPER_H_
 #define CHROME_BROWSER_NET_URL_FIXER_UPPER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 31 matching lines @@
   // possibly_invalid_spec().
   //
   // If |desired_tld| is non-empty, it represents the TLD the user wishes to
   // append in the case of an incomplete domain.  We check that this is not a
   // file path and there does not appear to be a valid TLD already, then append
   // |desired_tld| to the domain and prepend "www." (unless it, or a scheme,
   // are already present.)  This TLD should not have a leading '.' (use "com"
   // 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
   // to a "file:" URL in |fixed_up_url|; otherwise, fall back to the behavior
   // of FixupURL().
   //
   // For "regular" input, even if it is possibly a file with a full path, you
   // should use FixupURL() directly.  This function should only be used when
   // relative path handling is desired, as for command line processing.
   GURL FixupRelativeFile(const FilePath& base_dir, const FilePath& text);
 
   // Offsets the beginning index of |part| by |offset|, which is allowed to be
   // negative.  In some cases, the desired component does not exist at the given
   // offset.  For example, when converting from "http://foo" to "foo", the
   // scheme component no longer exists.  In such a case, the beginning index is
   // set to 0.
   // Does nothing if |part| is invalid.
   void OffsetComponent(int offset, url_parse::Component* part);
 
   // For paths like ~, we use $HOME for the current user's home
   // directory.  For tests, we allow our idea of $HOME to be overriden
   // by this variable.
   extern const char* home_directory_override;
 };
 
 #endif  // CHROME_BROWSER_NET_URL_FIXER_UPPER_H_