Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/webkit_context.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 "content/browser/in_process_webkit/webkit_context.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 74 matching lines @@
 void WebKitContext::SaveSessionState() {
   if (!BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED)) {
     BrowserThread::PostTask(
         BrowserThread::WEBKIT_DEPRECATED, FROM_HERE,
         base::Bind(&WebKitContext::SaveSessionState, this));
     return;
   }
   dom_storage_context_->SaveSessionState();
   indexed_db_context_->SaveSessionState();
 }
+
+void WebKitContext::DeleteUnneededSessionStorages(
+    const std::set<std::string>& needed_session_storages) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED)) {
+    BrowserThread::PostTask(
+        BrowserThread::WEBKIT_DEPRECATED, FROM_HERE,
+        base::Bind(&WebKitContext::DeleteUnneededSessionStorages, this,
+                   needed_session_storages));
+    return;
+  }
+
+  dom_storage_context_->DeleteUnneededSessionStorages(needed_session_storages);
+}