Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/dom_storage_area.cc

Index: content/browser/in_process_webkit/dom_storage_area.cc
diff --git a/content/browser/in_process_webkit/dom_storage_area.cc b/content/browser/in_process_webkit/dom_storage_area.cc
index cb69f172ad2b2fa1cf4ffb5fde1552c01dea4de0..0327d1dd61fe3d8d96d92e0687269fe3c870a90b 100644
--- a/content/browser/in_process_webkit/dom_storage_area.cc
+++ b/content/browser/in_process_webkit/dom_storage_area.cc
@@ -74,6 +74,14 @@ void DOMStorageArea::PurgeMemory() {
   storage_area_.reset();
 }
 
+void DOMStorageArea::CopyDataTo(DOMStorageArea* other) {
+  for (unsigned i = 0; i < Length(); ++i) {
+    string16 key = Key(i).string();
+    WebStorageArea::Result result;
+    other->SetItem(key, GetItem(key).string(), &result);
+  }
+}
+
 void DOMStorageArea::CreateWebStorageAreaIfNecessary() {
   if (!storage_area_.get())
     storage_area_.reset(owner_->CreateWebStorageArea(origin_));