Removed ChromeBrowserState::AsTestChromeBrowserState.

ios/chrome/browser/browser_state/chrome_browser_state.mm

 // 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 "ios/chrome/browser/browser_state/chrome_browser_state.h"
 
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 45 matching lines @@
   base::FilePath browser_state_path =
       GetOriginalChromeBrowserState()->GetStatePath();
   return JsonPrefStore::GetTaskRunnerForFile(browser_state_path,
                                              web::WebThread::GetBlockingPool());
 }
 
 sync_preferences::PrefServiceSyncable* ChromeBrowserState::GetSyncablePrefs() {
   return static_cast<sync_preferences::PrefServiceSyncable*>(GetPrefs());
 }
 
-TestChromeBrowserState* ChromeBrowserState::AsTestChromeBrowserState() {
-  return nullptr;
-}
-
 net::URLRequestContextGetter* ChromeBrowserState::GetRequestContext() {
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
   if (!request_context_getter_) {
     ProtocolHandlerMap protocol_handlers;
     protocol_handlers[kChromeUIScheme] =
         linked_ptr<net::URLRequestJobFactory::ProtocolHandler>(
             web::URLDataManagerIOSBackend::CreateProtocolHandler(this)
                 .release());
     request_context_getter_ =
         make_scoped_refptr(CreateRequestContext(&protocol_handlers));
   }
   return request_context_getter_.get();
 }
 
 }  // namespace ios