Remove isolated app code from iOS's chrome_browser_state_io_data.

ios/chrome/browser/browser_state/chrome_browser_state_impl.cc

 // Copyright 2013 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/chrome_browser_state_impl.h"
 
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 209 matching lines @@
     ProtocolHandlerMap* protocol_handlers,
     URLRequestInterceptorScopedVector request_interceptors) {
   ApplicationContext* application_context = GetApplicationContext();
   return io_data_
       ->CreateMainRequestContextGetter(
           protocol_handlers, application_context->GetLocalState(),
           application_context->GetIOSChromeIOThread())
       .get();
 }
 
-net::URLRequestContextGetter*
-ChromeBrowserStateImpl::CreateIsolatedRequestContext(
-    const base::FilePath& partition_path) {
-  return io_data_->CreateIsolatedAppRequestContextGetter(partition_path).get();
-}
-
 void ChromeBrowserStateImpl::ClearNetworkingHistorySince(
     base::Time time,
     const base::Closure& completion) {
   io_data_->ClearNetworkingHistorySince(time, completion);
 }
 
 PrefProxyConfigTracker* ChromeBrowserStateImpl::GetProxyConfigTracker() {
   if (!pref_proxy_config_tracker_) {
     pref_proxy_config_tracker_ =
         ios::ProxyServiceFactory::CreatePrefProxyConfigTrackerOfProfile(
             GetPrefs(), GetApplicationContext()->GetLocalState());
   }
   return pref_proxy_config_tracker_.get();
 }
 
 net::SSLConfigService* ChromeBrowserStateImpl::GetSSLConfigService() {
   // If ssl_config_service_manager_ is null, this typically means that some
   // KeyedService is trying to create a RequestContext at startup,
   // but SSLConfigServiceManager is not initialized until DoFinalInit() which is
   // invoked after all KeyedServices have been initialized (see
   // http://crbug.com/171406).
   DCHECK(ssl_config_service_manager_)
       << "SSLConfigServiceManager is not initialized yet";
   return ssl_config_service_manager_->Get();
 }