Deprecate most of gaia_auth extension

chrome/browser/extensions/signin/gaia_auth_extension_loader.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 "chrome/browser/extensions/signin/gaia_auth_extension_loader.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 50 matching lines @@
   GetComponentLoader(context)->Remove(extensions::kGaiaAuthExtensionId);
 }
 
 }  // namespace
 
 namespace extensions {
 
 GaiaAuthExtensionLoader::GaiaAuthExtensionLoader(BrowserContext* context)
     : browser_context_(context),
       load_count_(0),
-      last_data_id_(0),
       weak_ptr_factory_(this) {
 }
 
 GaiaAuthExtensionLoader::~GaiaAuthExtensionLoader() {
   DCHECK_EQ(0, load_count_);
 }
 
 void GaiaAuthExtensionLoader::LoadIfNeeded() {
   if (load_count_ == 0)
     LoadGaiaAuthExtension(browser_context_);
   ++load_count_;
 }
 
 void GaiaAuthExtensionLoader::UnloadIfNeededAsync() {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&GaiaAuthExtensionLoader::UnloadIfNeeded,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void GaiaAuthExtensionLoader::UnloadIfNeeded() {
   --load_count_;
   if (load_count_ == 0) {
     UnloadGaiaAuthExtension(browser_context_);
-    data_.clear();
   }
 }
 
 void GaiaAuthExtensionLoader::Shutdown() {
   if (load_count_ > 0) {
     UnloadGaiaAuthExtension(browser_context_);
     load_count_ = 0;
   }
-  data_.clear();
 }
 
 // static
 GaiaAuthExtensionLoader* GaiaAuthExtensionLoader::Get(BrowserContext* context) {
   return BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader>::Get(context);
 }
 
 static base::LazyInstance<
     BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader> > g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader>*
 GaiaAuthExtensionLoader::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 } // namespace extensions