Refactor net::BackoffEntry to not require subclassing

components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.cc

 // Copyright 2015 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_config_service_client.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 138 matching lines @@
 
 void DataReductionProxyConfigServiceClient::SetConfigRefreshTimer(
     const base::TimeDelta& delay) {
   DCHECK(delay >= base::TimeDelta());
   config_refresh_timer_.Stop();
   config_refresh_timer_.Start(
       FROM_HERE, delay, this,
       &DataReductionProxyConfigServiceClient::RetrieveConfig);
 }
 
-base::Time DataReductionProxyConfigServiceClient::Now() const {
+base::Time DataReductionProxyConfigServiceClient::Now() {
   return base::Time::Now();
 }
 
 std::string
 DataReductionProxyConfigServiceClient::ConstructStaticResponse() const {
   std::string response;
   scoped_ptr<base::DictionaryValue> values(new base::DictionaryValue());
   params_->PopulateConfigResponse(values.get());
   request_options_->PopulateConfigResponse(values.get());
   base::JSONWriter::Write(values.get(), &response);
 
   return response;
 }
 
 }  // namespace data_reduction_proxy