Remove DeleteTask and convert remaining users.

chrome/browser/search_engines/search_provider_install_data_unittest.cc

 // Copyright (c) 2011 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 <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
@@ skipping 155 matching lines @@
     testing::Test::SetUp();
     util_.SetUp();
     util_.StartIOThread();
     install_data_ = new SearchProviderInstallData(
         util_.GetWebDataService(),
         content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
         content::Source<SearchProviderInstallDataTest>(this));
   }
 
   virtual void TearDown() {
-    BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)->PostTask(
-        FROM_HERE,
-        new DeleteTask<SearchProviderInstallData>(install_data_));
+    BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, install_data_);
     install_data_ = NULL;
 
     // Make sure that the install data class on the UI thread gets cleaned up.
     // It doesn't matter that this happens after install_data_ is deleted.
     content::NotificationService::current()->Notify(
         content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
         content::Source<SearchProviderInstallDataTest>(this),
         content::NotificationService::NoDetails());
 
     util_.TearDown();
@@ skipping 117 matching lines @@
   // Change the Google base url.
   google_host = "foo.com";
   util_.SetGoogleBaseURL("http://" + google_host + "/");
   // Wait for the I/O thread to process the update notification.
   TemplateURLServiceTestUtil::BlockTillIOThreadProcessesRequests();
 
   // Verify that the change got picked up.
   test_get_install_state->set_search_provider_host(google_host);
   EXPECT_TRUE(test_get_install_state->RunTests());
 }