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

chrome/browser/icon_manager_mac.mm

Index: chrome/browser/icon_manager_mac.mm
diff --git a/chrome/browser/icon_manager_mac.mm b/chrome/browser/icon_manager_mac.mm
deleted file mode 100644
index 6f41c7c4cc448d25067e19b90fe0c969d2bebf59..0000000000000000000000000000000000000000
--- a/chrome/browser/icon_manager_mac.mm
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2009 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/files/file_path.h"
-#include "base/strings/sys_string_conversions.h"
-
-IconGroupID IconManager::GetGroupIDFromFilepath(
-    const base::FilePath& filepath) {
-  return filepath.Extension();
-}