Update SupportsUserData uses with unique_ptr.

components/zoom/zoom_event_manager.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 "components/zoom/zoom_event_manager.h"
 
+#include "base/memory/ptr_util.h"
 #include "components/zoom/zoom_event_manager_observer.h"
 #include "content/public/browser/browser_context.h"
 
 namespace {
 static const char kBrowserZoomEventManager[] = "browser_zoom_event_manager";
 }
 
 namespace zoom {
 
 ZoomEventManager* ZoomEventManager::GetForBrowserContext(
     content::BrowserContext* context) {
-  if (!context->GetUserData(kBrowserZoomEventManager))
-    context->SetUserData(kBrowserZoomEventManager, new ZoomEventManager);
+  if (!context->GetUserData(kBrowserZoomEventManager)) {
+    context->SetUserData(kBrowserZoomEventManager,
+                         base::MakeUnique<ZoomEventManager>());
+  }
   return static_cast<ZoomEventManager*>(
       context->GetUserData(kBrowserZoomEventManager));
 }
 
 ZoomEventManager::ZoomEventManager() : weak_ptr_factory_(this) {}
 
 ZoomEventManager::~ZoomEventManager() {}
 
 void ZoomEventManager::OnZoomLevelChanged(
     const content::HostZoomMap::ZoomLevelChange& change) {
@@ skipping 15 matching lines @@
     ZoomEventManagerObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void ZoomEventManager::RemoveZoomEventManagerObserver(
     ZoomEventManagerObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 }  // namespace zoom