Disable SDCH by Default

ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm

 // 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 "ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.h"
 
 #import <UIKit/UIKit.h>
 
 #include <utility>
 
@@ skipping 197 matching lines @@
 
   main_context->set_http_transaction_factory(main_http_factory_.get());
 
   std::unique_ptr<net::URLRequestJobFactoryImpl> main_job_factory(
       new net::URLRequestJobFactoryImpl());
 
   InstallProtocolHandlers(main_job_factory.get(), protocol_handlers);
   main_job_factory_ = SetUpJobFactoryDefaults(std::move(main_job_factory),
                                               main_context->network_delegate());
   main_context->set_job_factory(main_job_factory_.get());
-
-  // Setup SDCH for this profile.
-  sdch_manager_.reset(new net::SdchManager);
-  sdch_policy_.reset(new net::SdchOwner(sdch_manager_.get(), main_context));
-  main_context->set_sdch_manager(sdch_manager_.get());
 }
 
 ChromeBrowserStateIOData::AppRequestContext*
 OffTheRecordChromeBrowserStateIOData::InitializeAppRequestContext(
     net::URLRequestContext* main_context) const {
   NOTREACHED();
   return nullptr;
 }
 
 ChromeBrowserStateIOData::AppRequestContext*
 OffTheRecordChromeBrowserStateIOData::AcquireIsolatedAppRequestContext(
     net::URLRequestContext* main_context) const {
   NOTREACHED();
   return nullptr;
 }