Unload the ScopedGaiaAuthExtension asynchronously.

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"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/signin/signin_promo.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "extensions/browser/extension_system.h"
@@ skipping 58 matching lines @@
         base::Bind(&base::DoNothing));
   }
   GetComponentLoader(context)->Remove(extensions::kGaiaAuthExtensionId);
 }
 
 }  // namespace
 
 namespace extensions {
 
 GaiaAuthExtensionLoader::GaiaAuthExtensionLoader(BrowserContext* context)
-    : browser_context_(context), load_count_(0), last_data_id_(0) {}
+    : 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();
   }
 }
 
 int GaiaAuthExtensionLoader::AddData(const std::string& data) {
   ++last_data_id_;
@@ skipping 27 matching lines @@
     BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader> > g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<GaiaAuthExtensionLoader>*
 GaiaAuthExtensionLoader::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 } // namespace extensions