Restructure sandbox code to reduce dependencies pulled in by intercept code.

sandbox/win/src/sandbox.cc

 // Copyright (c) 2006-2008 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 <stdio.h>
 #include <windows.h>
 #include "sandbox/win/src/sandbox.h"
 #include "sandbox/win/src/sandbox_factory.h"
 #include "sandbox/win/src/broker_services.h"
 #include "sandbox/win/src/target_services.h"
 
 namespace sandbox {
 // The section for IPC and policy.
-SANDBOX_INTERCEPT HANDLE  g_shared_section = NULL;
+SANDBOX_INTERCEPT HANDLE  g_shared_section;
 
 static bool               s_is_broker =  false;
 
 // GetBrokerServices: the current implementation relies on a shared section
 // that is created by the broker and opened by the target.
 BrokerServices* SandboxFactory::GetBrokerServices() {
   // Can't be the broker if the shared section is open.
   if (NULL != g_shared_section) {
     return NULL;
   }
@@ skipping 10 matching lines @@
   if (NULL == g_shared_section) {
     return NULL;
   }
   // We are the target
   s_is_broker = false;
   // Creates and returns the target services implementation.
   return TargetServicesBase::GetInstance();
 }
 
 }  // namespace sandbox