Fix memory leaks in unit tests from my previous checkin.

chrome/browser/dom_ui/new_tab_ui.cc

 // Copyright (c) 2006-2009 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 "build/build_config.h"
 
 #include "chrome/browser/dom_ui/new_tab_ui.h"
 
 #include <set>
 
@@ skipping 554 matching lines @@
 #if !defined(OS_POSIX)
     if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableSync)) {
       AddMessageHandler((new NewTabPageSyncHandler())->Attach(this));
     }
 #endif
 
     AddMessageHandler((new NewTabPageSetHomepageHandler())->Attach(this));
 
     InitializeCSSCaches();
     NewTabHTMLSource* html_source = new NewTabHTMLSource(GetProfile());
-    ChromeThread::PostTask(
+    bool posted = ChromeThread::PostTask(
         ChromeThread::IO, FROM_HERE,
         NewRunnableMethod(
             &chrome_url_data_manager,
             &ChromeURLDataManager::AddDataSource,
             html_source));
+    if (!posted)
+      delete html_source;  // Keep Valgrind happy in tests.
   }
 
   // Listen for theme installation.
   registrar_.Add(this, NotificationType::BROWSER_THEME_CHANGED,
                  NotificationService::AllSources());
   // Listen for bookmark bar visibility changes.
   registrar_.Add(this, NotificationType::BOOKMARK_BAR_VISIBILITY_PREF_CHANGED,
                  NotificationService::AllSources());
 }
 
@@ skipping 16 matching lines @@
     CallJavascriptFunction(L"themeChanged");
   } else if (NotificationType::BOOKMARK_BAR_VISIBILITY_PREF_CHANGED) {
     if (GetProfile()->GetPrefs()->GetBoolean(prefs::kShowBookmarkBar))
       CallJavascriptFunction(L"bookmarkBarAttached");
     else
       CallJavascriptFunction(L"bookmarkBarDetached");
   }
 }
 
 void NewTabUI::InitializeCSSCaches() {
-  ChromeThread::PostTask(
+  DOMUIThemeSource* theme = new DOMUIThemeSource(GetProfile());
+  bool posted = ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
       NewRunnableMethod(
           &chrome_url_data_manager,
           &ChromeURLDataManager::AddDataSource,
-          new DOMUIThemeSource(GetProfile())));
+          theme));
+  if (!posted)
+    delete theme;  // Keep Valgrind happy in tests.
 }
 
 // static
 void NewTabUI::RegisterUserPrefs(PrefService* prefs) {
   MostVisitedHandler::RegisterUserPrefs(prefs);
   ShownSectionsHandler::RegisterUserPrefs(prefs);
   if (NewTabUI::WebResourcesEnabled())
     TipsHandler::RegisterUserPrefs(prefs);
 }
 
@@ skipping 272 matching lines @@
   std::string json_html;
   jstemplate_builder::AppendJsonHtml(&localized_strings, &json_html);
 
   static const std::string template_data_placeholder =
       "<!-- template data placeholder -->";
   ReplaceFirstSubstringAfterOffset(&full_html_, 0, template_data_placeholder,
       json_html);
 
   jstemplate_builder::AppendI18nTemplateProcessHtml(&full_html_);
 }