Bug 977723 - Remove two unused vars in accessible/. r=surkov

accessible/src/generic/Accessible.cpp

@@ -933,7 +933,6 @@ Accessible::GetBoundsRect(nsRect& aTotalBounds, nsIFrame** aBoundingFrame)
       if (canvasFrame) {
         *aBoundingFrame = canvasFrame;
 
-        nsPresContext* presContext = mDoc->PresContext();
         aTotalBounds = *hitRegionRect;
 
         return;

accessible/src/generic/HyperTextAccessible.cpp

@@ -1791,7 +1791,6 @@ HyperTextAccessible::GetSpellTextAttribute(nsINode* aNode,
     return NS_OK;
 
   int32_t startHTOffset = 0, endHTOffset = 0;
-  nsresult rv = NS_OK;
   for (int32_t idx = 0; idx < rangeCount; idx++) {
     nsRange* range = domSel->GetRangeAt(idx);
     if (range->Collapsed())