Fix memory leak on Chromium OS Heapcheck and Chromium OS (valgrind)

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index 15fba6b576d0d02381e576ad0bd48c6d49d53f1a..bf7060af1fc78b9947d2081a659535bd73b25734 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -285,6 +285,10 @@ void RootWindowController::CreateContainers() {
 
 void RootWindowController::CloseChildWindows() {
   // Close background widget first as it depends on tooltip.
+  if (root_window_->GetProperty(internal::kComponentWrapper) &&
+      (root_window_->GetProperty(internal::kWindowDesktopComponent) !=
+       root_window_->GetProperty(internal::kComponentWrapper)->component()))
+    delete root_window_->GetProperty(internal::kComponentWrapper)->component();
   root_window_->SetProperty(kWindowDesktopComponent,
       static_cast<DesktopBackgroundWidgetController*>(NULL));
   root_window_->SetProperty(kComponentWrapper,