Another stab at the Chromium side of storage events. The WebKit side can be ...

chrome/browser/in_process_webkit/webkit_context.cc

 // Copyright (c) 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 "chrome/browser/in_process_webkit/webkit_context.h"
 
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/in_process_webkit/dom_storage_context.h"
 
 WebKitContext::WebKitContext(const FilePath& data_path, bool is_incognito)
     : data_path_(data_path),
-      is_incognito_(is_incognito) {
+      is_incognito_(is_incognito),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          dom_storage_context_(new DOMStorageContext(this))) {
 }
 
 WebKitContext::~WebKitContext() {
-  // If a dom storage context was ever created, we need to destroy it on the
-  // WebKit thread.  Luckily we're guaranteed that the WebKit thread is still
-  // alive since the ResourceDispatcherHost (which owns the WebKit thread) goes
-  // away after all the ResourceMessageFilters and the profiles (i.e. all the
-  // objects with a reference to us).
-  if (dom_storage_context_.get()) {
-    MessageLoop* loop = ChromeThread::GetMessageLoop(ChromeThread::WEBKIT);
-    loop->DeleteSoon(FROM_HERE, dom_storage_context_.release());
-  }
+  // If the WebKit thread was ever spun up, delete the object there.  If we're
+  // on the IO thread, this is safe because the WebKit thread goes away after
+  // the IO.  If we're on the UI thread, we're safe because the UI thread kills
+  // the WebKit thread.
+  MessageLoop* webkit_loop = ChromeThread::GetMessageLoop(ChromeThread::WEBKIT);
+  if (webkit_loop)
+    webkit_loop->DeleteSoon(FROM_HERE, dom_storage_context_.release());
 }
-
-DOMStorageContext* WebKitContext::GetDOMStorageContext() {
-  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::WEBKIT));
-  if (!dom_storage_context_.get())
-    dom_storage_context_.reset(new DOMStorageContext(this));
-  return dom_storage_context_.get();
-}