Remove all but one use of WeakPtrFactory::DetachFromThread.

chrome/browser/search_engines/search_provider_install_data.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/search_engines/search_provider_install_data.h"
 
 #include <algorithm>
 #include <functional>
 #include <vector>
 
@@ skipping 149 matching lines @@
     Profile* profile,
     int ui_death_notification,
     const content::NotificationSource& ui_death_source)
     : web_service_(WebDataService::FromBrowserContext(profile)),
       load_handle_(0),
       google_base_url_(UIThreadSearchTermsData(profile).GoogleBaseURLValue()) {
   // GoogleURLObserver is responsible for killing itself when
   // the given notification occurs.
   new GoogleURLObserver(profile, new GoogleURLChangeNotifier(AsWeakPtr()),
                         ui_death_notification, ui_death_source);
-  DetachFromThread();
 }
 
 SearchProviderInstallData::~SearchProviderInstallData() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (load_handle_) {
     DCHECK(web_service_.get());
     web_service_->CancelRequest(load_handle_);
   }
 }
@@ skipping 115 matching lines @@
 
   std::for_each(closure_queue.begin(),
                 closure_queue.end(),
                 std::mem_fun_ref(&base::Closure::Run));
 
   // Since we expect this request to be rare, clear out the information. This
   // also keeps the responses current as the search providers change.
   provider_map_.reset();
   SetDefault(NULL);
 }