Fix memory leaks from adding GPU memory to task manager

chrome/browser/task_manager/task_manager.cc

 // Copyright (c) 2012 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/task_manager/task_manager.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
@@ skipping 962 matching lines @@
           OVERRIDE {
     if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
       NotifyVideoMemoryUsageStats(video_memory_usage_stats);
     } else {
       BrowserThread::PostTask(
           BrowserThread::UI, FROM_HERE, base::Bind(
               &TaskManagerModelGpuDataManagerObserver::
                   NotifyVideoMemoryUsageStats,
               video_memory_usage_stats));
     }
-    delete this;
   }
 };
 
 void TaskManagerModel::RefreshVideoMemoryUsageStats()
 {
   if (pending_video_memory_usage_stats_update_) return;
+  if (!video_memory_usage_stats_observer_.get()) {
+    video_memory_usage_stats_observer_.reset(
+        new TaskManagerModelGpuDataManagerObserver());
+  }
   pending_video_memory_usage_stats_update_ = true;
-  new TaskManagerModelGpuDataManagerObserver;
   content::GpuDataManager::GetInstance()->RequestVideoMemoryUsageStatsUpdate();
 }
 
 void TaskManagerModel::Refresh() {
   DCHECK_NE(IDLE, update_state_);
 
   if (update_state_ == STOPPING) {
     // We have been asked to stop.
     update_state_ = IDLE;
     return;
@@ skipping 322 matching lines @@
     // Count the number of extensions with background pages (including
     // incognito).
     count += CountExtensionBackgroundPagesForProfile(profile);
     if (profile->HasOffTheRecordProfile()) {
       count += CountExtensionBackgroundPagesForProfile(
           profile->GetOffTheRecordProfile());
     }
   }
   return count;
 }