Refactor: Simplify WaitableEventWatcher.

chrome/browser/browsing_data/browsing_data_remover.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/browsing_data/browsing_data_remover.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 400 matching lines @@
   // check the origin_set_mask_ to prevent unintended deletion.
   if (remove_mask & REMOVE_PLUGIN_DATA &&
       origin_set_mask_ & BrowsingDataHelper::UNPROTECTED_WEB) {
     content::RecordAction(UserMetricsAction("ClearBrowsingData_LSOData"));
 
     waiting_for_clear_plugin_data_ = true;
     if (!plugin_data_remover_.get())
       plugin_data_remover_.reset(content::PluginDataRemover::Create(profile_));
     base::WaitableEvent* event =
         plugin_data_remover_->StartRemoving(delete_begin_);
-    watcher_.StartWatching(event, this);
+
+    base::WaitableEventWatcher::EventCallback watcher_callback =
+        base::Bind(&BrowsingDataRemover::OnWaitableEventSignaled,
+                   base::Unretained(this));
+    watcher_.StartWatching(event, watcher_callback);
   }
 #endif
 
   if (remove_mask & REMOVE_PASSWORDS) {
     content::RecordAction(UserMetricsAction("ClearBrowsingData_Passwords"));
     PasswordStore* password_store = PasswordStoreFactory::GetForProfile(
         profile_, Profile::EXPLICIT_ACCESS);
 
     if (password_store)
       password_store->RemoveLoginsCreatedBetween(delete_begin_, delete_end_);
@@ skipping 584 matching lines @@
       BrowserThread::UI, FROM_HERE,
       base::Bind(&BrowsingDataRemover::OnClearedFormData,
                  base::Unretained(this)));
 }
 
 void BrowsingDataRemover::OnClearedFormData() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   waiting_for_clear_form_ = false;
   NotifyAndDeleteIfDone();
 }