Revert of Allow use of Mojo/V8 ProxyResolvers with URLRequestContextBuilder.

net/proxy/test_mojo_proxy_resolver_factory.h

-// Copyright 2017 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_TEST_MOJO_PROXY_RESOLVER_FACTORY_H_
-#define NET_PROXY_TEST_MOJO_PROXY_RESOLVER_FACTORY_H_
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/singleton.h"
-#include "net/proxy/mojo_proxy_resolver_factory.h"
-
-namespace net {
-
-// MojoProxyResolverFactory that runs PAC scripts in-process, for tests.
-class TestMojoProxyResolverFactory : public MojoProxyResolverFactory {
- public:
-  static TestMojoProxyResolverFactory* GetInstance();
-
-  // Returns true if CreateResolver was called.
-  bool resolver_created() { return resolver_created_; }
-
-  // Sets the value returned by resolver_created. Since this is a singleton,
-  // Serves to avoid with test fixture reuse.
-  void set_resolver_created(bool resolver_created) {
-    resolver_created_ = resolver_created;
-  }
-
-  // Overridden from MojoProxyResolverFactory:
-  std::unique_ptr<base::ScopedClosureRunner> CreateResolver(
-      const std::string& pac_script,
-      mojo::InterfaceRequest<interfaces::ProxyResolver> req,
-      interfaces::ProxyResolverFactoryRequestClientPtr client) override;
-
- private:
-  TestMojoProxyResolverFactory();
-  ~TestMojoProxyResolverFactory() override;
-
-  friend struct base::DefaultSingletonTraits<TestMojoProxyResolverFactory>;
-
-  interfaces::ProxyResolverFactoryPtr factory_;
-
-  bool resolver_created_ = false;
-
-  DISALLOW_COPY_AND_ASSIGN(TestMojoProxyResolverFactory);
-};
-
-}  // namespace net
-
-#endif  // NET_PROXY_TEST_MOJO_PROXY_RESOLVER_FACTORY_H_