Add a MockAsyncProxyResolverFactory and update some tests to use it.

net/proxy/proxy_resolver_factory.h

 // Copyright 2015 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_PROXY_PROXY_RESOLVER_FACTORY_H_
 #define NET_PROXY_PROXY_RESOLVER_FACTORY_H_
 
+#include <set>
+
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/proxy/proxy_resolver_script_data.h"
 
 namespace net {
 
 class ProxyResolver;
 
 // ProxyResolverFactory is an interface for creating ProxyResolver instances.
 class NET_EXPORT ProxyResolverFactory {
  public:
   // A handle to a request. Deleting it will cancel the request.
   class Request {
    public:
     virtual ~Request() {}
   };
 
   // See |expects_pac_bytes()| for the meaning of |expects_pac_bytes|.
   explicit ProxyResolverFactory(bool expects_pac_bytes);
 
   virtual ~ProxyResolverFactory();
 
   // Creates a new ProxyResolver. If the request will complete asynchronously,
   // it returns ERR_IO_PENDING and notifies the result by running |callback|.
   // If the result is OK, then |resolver| contains the ProxyResolver. In the
   // case of asynchronous completion |*request| is written to, and can be
-  // deleted to cancel the request.
+  // deleted to cancel the request. All requests in progress are cancelled if
+  // the ProxyResolverFactory is deleted.
   virtual int CreateProxyResolver(
       const scoped_refptr<ProxyResolverScriptData>& pac_script,
       scoped_ptr<ProxyResolver>* resolver,
       const net::CompletionCallback& callback,
       scoped_ptr<Request>* request) = 0;
 
   // The PAC script backend can be specified to the ProxyResolverFactory either
   // via URL, or via the javascript text itself. If |expects_pac_bytes| is true,
   // then the ProxyResolverScriptData passed to CreateProxyResolver() should
   // contain the actual script bytes rather than just the URL.
@@ skipping 11 matching lines @@
 
   ~LegacyProxyResolverFactory() override;
 
   int CreateProxyResolver(
       const scoped_refptr<ProxyResolverScriptData>& pac_script,
       scoped_ptr<ProxyResolver>* resolver,
       const net::CompletionCallback& callback,
       scoped_ptr<Request>* request) override;
 
   virtual scoped_ptr<ProxyResolver> CreateProxyResolver() = 0;
+
+ private:
+  class Job;
+
+  void RemoveJob(Job* job);
+
+  std::set<Job*> jobs_;
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_FACTORY_H_