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

net/url_request/https_prober.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_BASE_HTTPS_PROBER_H_
 #define NET_BASE_HTTPS_PROBER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 15 matching lines @@
   virtual void ProbeComplete(bool result) = 0;
  protected:
   virtual ~HTTPSProberDelegate() {}
 };
 
 // HTTPSProber is a singleton object that manages HTTPS probes. A HTTPS probe
 // determines if we can connect to a given host over HTTPS. It's used when
 // transparently upgrading from HTTP to HTTPS (for example, for SPDY).
 class HTTPSProber : public net::URLRequest::Delegate {
  public:
-  HTTPSProber();
-  ~HTTPSProber();
+  // Returns the singleton instance.
+  static HTTPSProber* GetInstance();
 
   // HaveProbed returns true if the given host is known to have been probed
   // since the browser was last started.
   bool HaveProbed(const std::string& host) const;
 
   // InFlight returns true iff a probe for the given host is currently active.
   bool InFlight(const std::string& host) const;
 
   // ProbeHost starts a new probe for the given host. If the host is known to
   // have been probed since the browser was started, false is returned and no
   // other action is taken. If a probe to the given host in currently inflight,
   // false will be returned, and no other action is taken. Otherwise, a new
   // probe is started, true is returned and the Delegate will be called with the
   // results (true means a successful handshake).
   bool ProbeHost(const std::string& host, URLRequestContext* ctx,
                  HTTPSProberDelegate* delegate);
 
   // Implementation of net::URLRequest::Delegate
   void OnAuthRequired(net::URLRequest* request,
                       net::AuthChallengeInfo* auth_info);
   void OnSSLCertificateError(net::URLRequest* request,
                              int cert_error,
                              net::X509Certificate* cert);
   void OnResponseStarted(net::URLRequest* request);
   void OnReadCompleted(net::URLRequest* request, int bytes_read);
 
  private:
+  HTTPSProber();
+  ~HTTPSProber();
+
   void Success(net::URLRequest* request);
   void Failure(net::URLRequest* request);
   void DoCallback(net::URLRequest* request, bool result);
 
   std::map<std::string, HTTPSProberDelegate*> inflight_probes_;
   std::set<std::string> probed_;
 
   friend struct DefaultSingletonTraits<HTTPSProber>;
   DISALLOW_COPY_AND_ASSIGN(HTTPSProber);
 };
 
 }  // namespace net
 #endif