Remove unused method nsLineBox::CombinedAreaIntersects. (Bug 542595, patch 5) r=roc a2.0=blocking2.0:beta8

layout/generic/nsLineBox.h

@@ -414,11 +414,6 @@ public:
   nsRect GetCombinedArea() {
     return mData ? mData->mCombinedArea : mBounds;
   }
-  PRBool CombinedAreaIntersects(const nsRect& aDamageRect) {
-    nsRect* ca = (mData ? &mData->mCombinedArea : &mBounds);
-    return !((ca->YMost() <= aDamageRect.y) ||
-             (ca->y >= aDamageRect.YMost()));
-  }
 
   void SlideBy(nscoord aDY) {
     mBounds.y += aDY;