Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/webkit_context.cc

Index: content/browser/in_process_webkit/webkit_context.cc
diff --git a/content/browser/in_process_webkit/webkit_context.cc b/content/browser/in_process_webkit/webkit_context.cc
index f1cb1da7072e0272c9412fc56db3520d16b0afd4..834acd423b83039e141a05e8d54e07805e9a5d6d 100644
--- a/content/browser/in_process_webkit/webkit_context.cc
+++ b/content/browser/in_process_webkit/webkit_context.cc
@@ -92,3 +92,16 @@ void WebKitContext::SaveSessionState() {
   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);
+}