stub impl of linux,mac icon loader/manager

chrome/browser/icon_loader_linux.cc

Index: chrome/browser/icon_loader_linux.cc
===================================================================
--- chrome/browser/icon_loader_linux.cc	(revision 0)
+++ chrome/browser/icon_loader_linux.cc	(revision 0)
@@ -0,0 +1,15 @@
+// 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_loader.h"
+
+#include "base/message_loop.h"
+#include "base/thread.h"
+
+void IconLoader::ReadIcon() {
+  NOTIMPLEMENTED();
+
+  target_message_loop_->PostTask(FROM_HERE,
+      NewRunnableMethod(this, &IconLoader::NotifyDelegate));
+}