rlz: Hook up on mac, switch to chrome's network stack on win.

chrome/browser/rlz/rlz_extension_api.h

 // 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.
 
 #ifndef CHROME_BROWSER_RLZ_RLZ_EXTENSION_API_H_
 #define CHROME_BROWSER_RLZ_RLZ_EXTENSION_API_H_
 #pragma once
 
 #include "build/build_config.h"
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_MACOSX)
 
 #include "chrome/browser/extensions/extension_function.h"
 
 class RlzRecordProductEventFunction : public SyncExtensionFunction {
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.rlz.recordProductEvent")
 };
 
 class RlzGetAccessPointRlzFunction : public SyncExtensionFunction {
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.rlz.getAccessPointRlz")
 };
 
 class RlzSendFinancialPingFunction : public SyncExtensionFunction {
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.rlz.sendFinancialPing")
  // Making this function protected so that it can be overridden in tests.
  protected:
   virtual bool RunImpl() OVERRIDE;
 };
 
 class RlzClearProductStateFunction : public SyncExtensionFunction {
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.rlz.clearProductState")
 };
 
-#endif  // defined(OS_WIN)
+#endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
 #endif  // CHROME_BROWSER_RLZ_RLZ_EXTENSION_API_H_