No bug - Reorder initialization in mozilla::layers::Transaction constructor to fix a build warning.

gfx/layers/ipc/ShadowLayers.cpp

@@ -67,8 +67,8 @@ class Transaction
 {
 public:
   Transaction()
-    : mOpen(false)
-    , mSwapRequired(false)
+    : mSwapRequired(false)
+    , mOpen(false)
   {}
 
   void Begin() { mOpen = true; }