Ensure tests have an active task runner

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings_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_settings.h"
 
 #include "base/command_line.h"
 #include "base/md5.h"
 #include "base/metrics/field_trial.h"
 #include "base/test/mock_entropy_provider.h"
@@ skipping 125 matching lines @@
   // Request 1 day. First day had 0 bytes so should be same as 0 days.
   settings_->GetContentLengths(1,
                                &original_content_length,
                                &received_content_length,
                                &last_update_time);
   EXPECT_EQ(expected_total_original_content_length, original_content_length);
   EXPECT_EQ(expected_total_received_content_length, received_content_length);
 }
 
 TEST(DataReductionProxySettingsStandaloneTest, TestEndToEndSecureProxyCheck) {
+  base::MessageLoopForIO message_loop;
   struct TestCase {
     const char* response_headers;
     const char* response_body;
     net::Error net_error_code;
     bool expected_restricted;
   };
   const TestCase kTestCases[] {
     { "HTTP/1.1 200 OK\r\n\r\n",
       "OK", net::OK, false,
     },
@@ skipping 52 matching lines @@
     drp_test_context->pref_service()->SetBoolean(
             prefs::kDataReductionProxyEnabled, true);
     drp_test_context->RunUntilIdle();
 
     EXPECT_EQ(test_case.expected_restricted,
               drp_test_context->test_configurator()->restricted());
   }
 }
 
 TEST(DataReductionProxySettingsStandaloneTest, TestOnProxyEnabledPrefChange) {
+  base::MessageLoopForIO message_loop;
   scoped_ptr<DataReductionProxyTestContext> drp_test_context =
       DataReductionProxyTestContext::Builder()
           .WithParamsFlags(DataReductionProxyParams::kAllowed |
                            DataReductionProxyParams::kFallbackAllowed |
                            DataReductionProxyParams::kPromoAllowed)
           .WithParamsDefinitions(
               TestDataReductionProxyParams::HAS_EVERYTHING &
                   ~TestDataReductionProxyParams::HAS_DEV_ORIGIN &
                   ~TestDataReductionProxyParams::HAS_DEV_FALLBACK_ORIGIN)
           .WithMockConfig()
@@ skipping 192 matching lines @@
         base::Bind(&DataReductionProxySettingsTestBase::
                    SyntheticFieldTrialRegistrationCallback,
                    base::Unretained(this)));
 
     EXPECT_EQ(enable_quic,
               test_context_->config()->test_params()->origin().is_quic()) << i;
   }
 }
 
 }  // namespace data_reduction_proxy