MOZ_COUNT_CTOR(PresShell);
PresShell::PresShell(){  MOZ_COUNT_CTOR(PresShell);  mIsDestroying = PR_FALSE;  mCaretEnabled = PR_FALSE;  mDisplayNonTextSelection = PR_FALSE;  mCurrentEventContent = nsnull;  mCurrentEventFrame = nsnull;  EnableScrolling();}