Bug 1053986 - Rename nsIFrame::IsCollapsed to IsXULCollapsed, and related methods. r=dholbert

This is a manual subset of changes written with sed, over .h and .cpp
files in layout/.  It's a subset because there is also a Selection
method called IsCollapsed, which is not changed here.

MozReview-Commit-ID: 9JgnPv0Hkff

layout/forms/nsTextControlFrame.cpp

@@ -593,7 +593,7 @@ nsTextControlFrame::GetXULMinSize(nsBoxLayoutState& aState)
 }
 
 bool
-nsTextControlFrame::IsCollapsed()
+nsTextControlFrame::IsXULCollapsed()
 {
   // We're never collapsed in the box sense.
   return false;