Bug 1465616 - Don't use SPC-SPS to layout fixed position elements. r=mstange

MozReview-Commit-ID: 5D4ErVFx8Bm

--HG--
extra : rebase_source : a930c2cb9492a6361ab16f0121b7a71dd6f6949c

layout/generic/ViewportFrame.cpp

@@ -281,15 +281,7 @@ ViewportFrame::AdjustReflowInputAsContainingBlock(ReflowInput* aReflowInput) con
                "We don't handle correct positioning of fixed frames with "
                "scrollbars in odd positions");
 
-  // If a scroll position clamping scroll-port size has been set, layout
-  // fixed position elements to this size instead of the computed size.
-  nsRect rect(0, 0, aReflowInput->ComputedWidth(), aReflowInput->ComputedHeight());
-  nsIPresShell* ps = PresShell();
-  if (ps->IsScrollPositionClampingScrollPortSizeSet()) {
-    rect.SizeTo(ps->GetScrollPositionClampingScrollPortSize());
-  }
-
-  return rect;
+  return nsRect(0, 0, aReflowInput->ComputedWidth(), aReflowInput->ComputedHeight());
 }
 
 void