Remove all but one use of WeakPtrFactory::DetachFromThread

chrome/browser/extensions/api/declarative/rules_registry_with_cache.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/extensions/api/declarative/rules_registry_with_cache.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 80 matching lines @@
                                                  log_storage_init_delay))
                                 ->GetWeakPtr()
                           : base::WeakPtr<RuleStorageOnUI>())) {
   if (!profile) {
     CHECK(!ui_part);
     return;
   }
 
   ui_part->reset(storage_on_ui_.get());
 
-  // After construction, |this| continues to live only on |owner_thread|.
-  weak_ptr_factory_.DetachFromThread();
-
   storage_on_ui_->Init();
 }
 
 std::string RulesRegistryWithCache::AddRules(
     const std::string& extension_id,
     const std::vector<linked_ptr<Rule> >& rules) {
   DCHECK(content::BrowserThread::CurrentlyOn(owner_thread()));
 
   // Verify that all rule IDs are new.
   for (std::vector<linked_ptr<Rule> >::const_iterator i =
@@ skipping 317 matching lines @@
 void RulesRegistryWithCache::RuleStorageOnUI::SetDeclarativeRulesStored(
     const std::string& extension_id,
     bool rules_stored) {
   CHECK(profile_);
   ExtensionScopedPrefs* extension_prefs = ExtensionPrefs::Get(profile_);
   extension_prefs->UpdateExtensionPref(
       extension_id, kRulesStoredKey, new base::FundamentalValue(rules_stored));
 }
 
 }  // namespace extensions