Ensure tests have an active task runner

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate_unittest.cc

 // Copyright 2014 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 "components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/test/histogram_tester.h"
 #include "base/test/mock_entropy_provider.h"
@@ skipping 129 matching lines @@
   }
 
   TestDataReductionProxyConfig* config() {
     return test_context_->config();
   }
 
   scoped_ptr<DataReductionProxyNetworkDelegate>
       data_reduction_proxy_network_delegate_;
 
  private:
+  base::MessageLoopForIO message_loop_;
   net::TestURLRequestContext context_;
   net::TestDelegate delegate_;
   // |test_job_interceptor_| is owned by |test_job_factory_|.
   net::TestJobInterceptor* test_job_interceptor_;
   net::URLRequestJobFactoryImpl test_job_factory_;
 
   net::ProxyConfig config_;
   net::NetworkDelegate* network_delegate_;
   scoped_ptr<DataReductionProxyTestContext> test_context_;
 };
@@ skipping 223 matching lines @@
                         &result);
   EXPECT_TRUE(result.is_direct());
 
   OnResolveProxyHandler(url, load_flags, data_reduction_proxy_config,
                         empty_proxy_retry_info, config(),
                         &other_proxy_info);
   EXPECT_FALSE(other_proxy_info.is_direct());
 }
 
 }  // namespace data_reduction_proxy