Reland of Pass SequencedTaskRunner to PowerSaveBlocker for ui/file ops

extensions/browser/api/power/power_api.cc

 // 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 "extensions/browser/api/power/power_api.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
+#include "content/public/browser/power_save_blocker_factory.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/api/power.h"
 #include "extensions/common/extension.h"
 
 namespace extensions {
 
 namespace {
 
 const char kPowerSaveBlockerDescription[] = "extension";
 
@@ skipping 45 matching lines @@
   UpdatePowerSaveBlocker();
 }
 
 void PowerAPI::RemoveRequest(const std::string& extension_id) {
   extension_levels_.erase(extension_id);
   UpdatePowerSaveBlocker();
 }
 
 void PowerAPI::SetCreateBlockerFunctionForTesting(
     CreateBlockerFunction function) {
-  create_blocker_function_ =
-      !function.is_null() ? function
-                          : base::Bind(&content::PowerSaveBlocker::Create);
+  create_blocker_function_ = !function.is_null()
+                                 ? function
+                                 : base::Bind(&content::CreatePowerSaveBlocker);
 }
 
 void PowerAPI::OnExtensionUnloaded(content::BrowserContext* browser_context,
                                    const Extension* extension,
                                    UnloadedExtensionInfo::Reason reason) {
   RemoveRequest(extension->id());
   UpdatePowerSaveBlocker();
 }
 
 PowerAPI::PowerAPI(content::BrowserContext* context)
     : browser_context_(context),
-      create_blocker_function_(base::Bind(&content::PowerSaveBlocker::Create)),
+      create_blocker_function_(base::Bind(&content::CreatePowerSaveBlocker)),
       current_level_(api::power::LEVEL_SYSTEM) {
   ExtensionRegistry::Get(browser_context_)->AddObserver(this);
 }
 
 PowerAPI::~PowerAPI() {
 }
 
 void PowerAPI::UpdatePowerSaveBlocker() {
   if (extension_levels_.empty()) {
     power_save_blocker_.reset();
@@ skipping 23 matching lines @@
 }
 
 void PowerAPI::Shutdown() {
   // Unregister here rather than in the d'tor; otherwise this call will recreate
   // the already-deleted ExtensionRegistry.
   ExtensionRegistry::Get(browser_context_)->RemoveObserver(this);
   power_save_blocker_.reset();
 }
 
 }  // namespace extensions