Adding synthetic field trial for DataReductionProxyEnabled

components/data_reduction_proxy/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/browser/data_reduction_proxy_settings.h"
 
 #include "base/command_line.h"
 #include "base/md5.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 402 matching lines @@
   ResetSettings(false, false, false, false, false);
   MockSettings* settings = static_cast<MockSettings*>(settings_.get());
   EXPECT_FALSE(settings->params()->allowed());
   EXPECT_CALL(*settings, RecordStartupState(PROXY_NOT_AVAILABLE));
 
   scoped_ptr<DataReductionProxyConfigurator> configurator(
       new TestDataReductionProxyConfig());
   settings_->SetProxyConfigurator(configurator.Pass());
   scoped_refptr<net::TestURLRequestContextGetter> request_context =
       new net::TestURLRequestContextGetter(base::MessageLoopProxy::current());
-  settings_->InitDataReductionProxySettings(&pref_service_,
-                                            &pref_service_,
-                                            request_context.get());
+  settings_->InitDataReductionProxySettings(
+      &pref_service_,
+      &pref_service_,
+      request_context.get(),
+      base::Bind(&DataReductionProxySettingsTestBase::
+                 RegisterSyntheticFieldTrialCallback,
+                 base::Unretained(this)));
 
   base::MessageLoop::current()->RunUntilIdle();
 }
 
 }  // namespace data_reduction_proxy