Revise about: and chrome: url handling.

chrome/browser/net/url_fixer_upper.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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>
 
 #include "base/string16.h"
@@ skipping 22 matching lines @@
 
   // Converts |text| to a fixed-up URL and returns it. Attempts to make
   // some "smart" adjustments to obviously-invalid input where possible.
   // |text| may be an absolute path to a file, which will get converted to a
   // "file:" URL.
   //
   // The result will be a "more" valid URL than the input. It may still not
   // be valid, so check the return value's validity or use
   // possibly_invalid_spec().
   //
+  // Schemes "about" and "chrome" are normalized to "chrome://", with slashes.
+  // "about:blank" is unaltered, as Webkit allows frames to access about:blank.
+  // Additionally, if a chrome URL does not have a valid host, as in "about:",
+  // the returned URL will have the host "version", as in "chrome://version".
+  //
   // 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);
 
   // 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
@@ skipping 14 matching lines @@
   // 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_