Removing base::ThreadRestrictions::ScopedAllowIO from icon_manager_linux.cc

chrome/browser/icon_manager_chromeos.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 "chrome/browser/icon_manager.h"
 
 #include "base/file_path.h"
 #include "base/string_util.h"
 
-IconGroupID IconManager::GetGroupIDFromFilepath(const FilePath& filepath) {
+IconGroupID IconManager::ReadGroupIDFromFilepath(const FilePath& filepath) {
   return StringToLowerASCII(filepath.Extension());
 }