Ensure tests have an active task runner

components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_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_request_options.h"
 
 #include "base/command_line.h"
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
@@ skipping 156 matching lines @@
     if (expected_header.empty()) {
       EXPECT_FALSE(headers.HasHeader(kChromeProxyHeader));
       return;
     }
     EXPECT_TRUE(headers.HasHeader(kChromeProxyHeader));
     std::string header_value;
     headers.GetHeader(kChromeProxyHeader, &header_value);
     EXPECT_EQ(expected_header, header_value);
   }
 
+  base::MessageLoopForIO message_loop_;
   scoped_ptr<TestDataReductionProxyRequestOptions> request_options_;
   scoped_ptr<DataReductionProxyTestContext> test_context_;
 };
 
 TEST_F(DataReductionProxyRequestOptionsTest, AuthHashForSalt) {
   std::string salt = "8675309"; // Jenny's number to test the hash generator.
   std::string salted_key = salt + kDataReductionProxyKey + salt;
   base::string16 expected_hash = base::UTF8ToUTF16(base::MD5String(salted_key));
   EXPECT_EQ(expected_hash,
             DataReductionProxyRequestOptions::AuthHashForSalt(
@@ skipping 189 matching lines @@
   std::string expire_time;
   EXPECT_TRUE(values->GetString("sessionKey", &session));
   EXPECT_TRUE(values->GetString("expireTime", &expire_time));
   EXPECT_EQ(
       "0-1633771873-1633771873-1633771873|96bd72ec4a050ba60981743d41787768",
       session);
   EXPECT_EQ("1970-01-02T00:00:00.000Z", expire_time);
 }
 
 }  // namespace data_reduction_proxy