Remove usage of SingleThreadTaskRunner from DataReductionProxyConfig.

components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
index 37ecf9678b17a8f8b531f52ae2d669d8b6b31229..9245544715ddb3a76a55a05ce27e498cae6fe83d 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
@@ -117,13 +117,12 @@ DataReductionProxyIOData::DataReductionProxyIOData(
     scoped_ptr<DataReductionProxyMutableConfigValues> mutable_config =
         DataReductionProxyMutableConfigValues::CreateFromParams(params.get());
     raw_mutable_config = mutable_config.get();
-    config_.reset(new DataReductionProxyConfig(
-        io_task_runner_, net_log, mutable_config.Pass(), configurator_.get(),
-        event_creator_.get()));
+    config_.reset(new DataReductionProxyConfig(net_log, mutable_config.Pass(),
+                                               configurator_.get(),
+                                               event_creator_.get()));
   } else {
     config_.reset(new DataReductionProxyConfig(
-        io_task_runner_, net_log, params.Pass(), configurator_.get(),
-        event_creator_.get()));
+        net_log, params.Pass(), configurator_.get(), event_creator_.get()));
   }
 
   // It is safe to use base::Unretained here, since it gets executed
@@ -146,7 +145,10 @@ DataReductionProxyIOData::DataReductionProxyIOData(
  }
 
  DataReductionProxyIOData::DataReductionProxyIOData()
-     : url_request_context_getter_(nullptr), weak_factory_(this) {
+     : client_(Client::UNKNOWN),
+       net_log_(nullptr),
+       url_request_context_getter_(nullptr),
+       weak_factory_(this) {
 }
 
 DataReductionProxyIOData::~DataReductionProxyIOData() {