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

ash/desktop_background/desktop_background_widget_controller.h

Index: ash/desktop_background/desktop_background_widget_controller.h
diff --git a/ash/desktop_background/desktop_background_widget_controller.h b/ash/desktop_background/desktop_background_widget_controller.h
index c50c4fa580c21507b90c96b9ea4213efd2b4502f..302e822375fcd5b80b40932eb66868acda59a09c 100644
--- a/ash/desktop_background/desktop_background_widget_controller.h
+++ b/ash/desktop_background/desktop_background_widget_controller.h
@@ -58,10 +58,13 @@ class ComponentWrapper {
   explicit ComponentWrapper(
       DesktopBackgroundWidgetController* component);
   ~ComponentWrapper() {}
-  DesktopBackgroundWidgetController* component() { return component_; }
+
+  // Gets the wrapped DesktopBackgroundWidgetController pointer. Caller should
+  // take ownership of the pointer if |pass_ownership| is true.
+  DesktopBackgroundWidgetController* GetComponent(bool pass_ownership);
 
  private:
-  DesktopBackgroundWidgetController* component_;
+  scoped_ptr<DesktopBackgroundWidgetController> component_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentWrapper);
 };