Fixed "blocking io" from FixupPath on UI thread.

components/url_fixer/url_fixer.cc

 // Copyright (c) 2012 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.
 
 #include "components/url_fixer/url_fixer.h"
 
 #include <algorithm>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 160 matching lines @@
   if (filename.length() > 1 && filename[1] == '|')
     filename[1] = ':';
 #elif defined(OS_POSIX)
   base::FilePath input_path(text);
   PrepareStringForFileOps(input_path, &filename);
   if (filename.length() > 0 && filename[0] == '~')
     filename = FixupHomedir(filename);
 #endif
 
   // Here, we know the input looks like a file.
-  GURL file_url = net::FilePathToFileURL(base::FilePath(filename));
+  GURL file_url = net::FilePathToFileURLNoCWD(base::FilePath(filename));

[davidben, 2015/04/14 16:26:22]

This is a loss of functionality for this function. Did you verify that no caller
of this function ever needs relative paths?

   if (file_url.is_valid()) {
     return base::UTF16ToUTF8(net::FormatUrl(file_url,
                                             std::string(),
                                             net::kFormatUrlOmitUsernamePassword,
                                             net::UnescapeRule::NORMAL,
                                             NULL,
                                             NULL,
                                             NULL));
   }
 
@@ skipping 477 matching lines @@
       part->reset();
   }
 }
 
 bool url_fixer::IsEquivalentScheme(const std::string& scheme1,
                                    const std::string& scheme2) {
   return scheme1 == scheme2 ||
       (scheme1 == url::kAboutScheme && scheme2 == kChromeUIScheme) ||
       (scheme1 == kChromeUIScheme && scheme2 == url::kAboutScheme);
 }