Add the CertVerifier class. It is based on the...

net/base/host_resolver.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 "net/base/host_resolver.h"
 
 #if defined(OS_WIN)
 #include <ws2tcpip.h>
 #include <wspiapi.h>  // Needed for Win2k compat.
 #elif defined(OS_POSIX)
@@ skipping 58 matching lines @@
           CompletionCallback* callback)
       : host_(host),
         port_(port),
         resolver_(resolver),
         addresses_(addresses),
         callback_(callback),
         origin_loop_(MessageLoop::current()),
         error_(OK),
         results_(NULL) {
   }
-  
+
   ~Request() {
     if (results_)
       freeaddrinfo(results_);
   }
 
   void DoLookup() {
     // Running on the worker thread
     error_ = ResolveAddrInfo(host_, port_, &results_);
 
     Task* reply = NewRunnableMethod(this, &Request::DoCallback);
 
     // The origin loop could go away while we are trying to post to it, so we
     // need to call its PostTask method inside a lock.  See ~HostResolver.
     {
       AutoLock locked(origin_loop_lock_);
       if (origin_loop_) {
         origin_loop_->PostTask(FROM_HERE, reply);
         reply = NULL;
       }
     }
-    
+
     // Does nothing if it got posted.
     delete reply;
   }
 
   void DoCallback() {
     // Running on the origin thread.
     DCHECK(error_ || results_);
 
     // We may have been cancelled!
     if (!resolver_)
@@ skipping 11 matching lines @@
 
     callback_->Run(error_);
   }
 
   void Cancel() {
     resolver_ = NULL;
 
     AutoLock locked(origin_loop_lock_);
     origin_loop_ = NULL;
   }
-  
+
  private:
   // Set on the origin thread, read on the worker thread.
   std::string host_;
   std::string port_;
 
   // Only used on the origin thread (where Resolve was called).
   HostResolver* resolver_;
   AddressList* addresses_;
   CompletionCallback* callback_;
 
@@ skipping 42 matching lines @@
           NewRunnableMethod(request_.get(), &Request::DoLookup), true)) {
     NOTREACHED();
     request_ = NULL;
     return ERR_FAILED;
   }
 
   return ERR_IO_PENDING;
 }
 
 }  // namespace net