Fixed "blocking io" from FixupPath on UI thread.

net/base/filename_util.cc

 // Copyright 2014 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 "net/base/filename_util.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
@@ skipping 10 matching lines @@
 
 // Prefix to prepend to get a file URL.
 static const base::FilePath::CharType kFileURLPrefix[] =
     FILE_PATH_LITERAL("file:///");
 
 GURL FilePathToFileURL(const base::FilePath& path) {
   // Produce a URL like "file:///C:/foo" for a regular file, or
   // "file://///server/path" for UNC. The URL canonicalizer will fix up the
   // latter case to be the canonical UNC form: "file://server/path"
   base::FilePath::StringType url_string(kFileURLPrefix);
-  if (!path.IsAbsolute()) {
-    base::FilePath current_dir;
-    PathService::Get(base::DIR_CURRENT, &current_dir);
-    url_string.append(current_dir.value());
-    url_string.push_back(base::FilePath::kSeparators[0]);
-  }
   url_string.append(path.value());
 
   // Now do replacement of some characters. Since we assume the input is a
   // literal filename, anything the URL parser might consider special should
   // be escaped here.
 
   // must be the first substitution since others will introduce percents as the
   // escape character
   ReplaceSubstringsAfterOffset(
       &url_string, 0, FILE_PATH_LITERAL("%"), FILE_PATH_LITERAL("%25"));
@@ skipping 106 matching lines @@
     if (file_path->value() == base::FilePath::kCurrentDirectory) {
       *file_path = base::FilePath(leaf_name);
     } else {
       *file_path = file_path->Append(leaf_name);
     }
   }
 #endif
 }
 
 }  // namespace net