Add a new GetInstance() method for singleton classes under chrome/service and /net.

net/url_request/url_request_job_manager.h

 // Copyright (c) 2010 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 NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H__
 #define NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H__
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/lock.h"
 #include "base/platform_thread.h"
 #include "net/url_request/url_request.h"
 
+template <typename T> struct DefaultSingletonTraits;
+
 // This class is responsible for managing the set of protocol factories and
 // request interceptors that determine how an URLRequestJob gets created to
 // handle an net::URLRequest.
 //
 // MULTI-THREADING NOTICE:
 //   net::URLRequest is designed to have all consumers on a single thread, and
 //   so no attempt is made to support ProtocolFactory or Interceptor instances
 //   being registered/unregistered or in any way poked on multiple threads.
 //   However, we do support checking for supported schemes FROM ANY THREAD
 //   (i.e., it is safe to call SupportsScheme on any thread).
 //
 class URLRequestJobManager {
  public:
-  URLRequestJobManager();
-  ~URLRequestJobManager();
+  // Returns the singleton instance.
+  static URLRequestJobManager* GetInstance();
 
   // Instantiate an URLRequestJob implementation based on the registered
   // interceptors and protocol factories.  This will always succeed in
   // returning a job unless we are--in the extreme case--out of memory.
   net::URLRequestJob* CreateJob(net::URLRequest* request) const;
 
   // Allows interceptors to hijack the request after examining the new location
   // of a redirect. Returns NULL if no interceptor intervenes.
   net::URLRequestJob* MaybeInterceptRedirect(net::URLRequest* request,
                                              const GURL& location) const;
@@ skipping 18 matching lines @@
   // Register/unregister a request interceptor.
   void RegisterRequestInterceptor(net::URLRequest::Interceptor* interceptor);
   void UnregisterRequestInterceptor(net::URLRequest::Interceptor* interceptor);
 
   void set_enable_file_access(bool enable) { enable_file_access_ = enable; }
   bool enable_file_access() const { return enable_file_access_; }
 
  private:
   typedef std::map<std::string, net::URLRequest::ProtocolFactory*> FactoryMap;
   typedef std::vector<net::URLRequest::Interceptor*> InterceptorList;
+  friend struct DefaultSingletonTraits<URLRequestJobManager>;
+
+  URLRequestJobManager();
+  ~URLRequestJobManager();
 
   mutable Lock lock_;
   FactoryMap factories_;
   InterceptorList interceptors_;
   bool enable_file_access_;
 
 #ifndef NDEBUG
   // We use this to assert that CreateJob and the registration functions all
   // run on the same thread.
   mutable PlatformThreadId allowed_thread_;
@@ skipping 21 matching lines @@
     // check back on.
     return true;
 #endif
   }
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestJobManager);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_MANAGER_H__