Bug 1042373 - Fix unused-in-opt-build WAE. r=burning.

content/media/gmp/GMPDecryptorChild.cpp

@@ -13,8 +13,10 @@ namespace mozilla {
 namespace gmp {
 
 GMPDecryptorChild::GMPDecryptorChild(GMPChild* aPlugin)
-  : mPlugin(aPlugin)
-  , mSession(nullptr)
+  : mSession(nullptr)
+#ifdef DEBUG
+  , mPlugin(aPlugin)
+#endif
 {
   MOZ_ASSERT(mPlugin);
 }

content/media/gmp/GMPDecryptorChild.h

@@ -114,11 +114,13 @@ private:
 
   virtual bool RecvDecryptingComplete() MOZ_OVERRIDE;
 
-  GMPChild* mPlugin;
-
   // GMP's GMPDecryptor implementation.
   // Only call into this on the (GMP process) main thread.
   GMPDecryptor* mSession;
+
+#ifdef DEBUG
+  GMPChild* mPlugin;
+#endif           
 };
 
 } // namespace gmp