Fix for bug 3477330

This patch fixs a crash bug caused by using a NULL DecryptHandle pointer in the DRM Framework.
Fix by using sp<DecryptHandle> instead.

Change-Id: I1355d4719857ab64ad6cd12803fcf19e45bb50a0

proprietary/wvm/include/WVMExtractorImpl.h

@@ -45,6 +45,8 @@ public:
 
     virtual sp<MetaData> getMetaData();
 
+    static void cleanup();
+
 protected:
     virtual ~WVMExtractorImpl();