Bug 758992 - Make the classes which use the XPCOM nsISupports implementation macros final, to avoid the warning about deleting using a pointer to a base class with virtual functions and no virtual dtor (more xpcom and gonk parts); r=jrmuizel

xpcom/tests/TestPipe.cpp

@@ -7,6 +7,7 @@
 
 #include "nsIPipe.h"
 #include "nsIMemory.h"
+#include "mozilla/Attributes.h"
 
 /** NS_NewPipe2 reimplemented, because it's not exported by XPCOM */
 nsresult TP_NewPipe2(nsIAsyncInputStream** input,
@@ -41,7 +42,7 @@ nsresult TP_NewPipe2(nsIAsyncInputStream** input,
  * which <size>-byte locations in mMemory are empty and which are filled.
  * Pretty stupid, but enough to test bug 394692.
  */
-class BackwardsAllocator : public nsIMemory
+class BackwardsAllocator MOZ_FINAL : public nsIMemory
 {
   public:
     BackwardsAllocator()