Consolidate icon loading on ChromeOS

chrome/browser/icon_manager_chromeos.cc

Index: chrome/browser/icon_manager_chromeos.cc
diff --git a/chrome/browser/icon_manager_chromeos.cc b/chrome/browser/icon_manager_chromeos.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2f82c8fd71de1491b29ddeb5c3b3035d96baf149
--- /dev/null
+++ b/chrome/browser/icon_manager_chromeos.cc
@@ -0,0 +1,12 @@
+// 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) {
+  return StringToLowerASCII(filepath.Extension());
+}