Pull the frequently-made check for drawingModel == NPDrawingModelQuickDraw out into a
helper function to avoid #ifdef'ing all of the new places that this check is made.

A few other #ifdef's are moved inside functions to allow their call sites to remain #ifdef-free,
and we rely on the compiler to optimise out the check (which will always be false in 64-bit) instead.

* Plugins/WebBaseNetscapePluginView.mm:
(isDrawingModelQuickDraw):
(-[WebBaseNetscapePluginView fixWindowPort]):
(-[WebBaseNetscapePluginView saveAndSetNewPortStateForUpdate:]):
(-[WebBaseNetscapePluginView sendEvent:isDrawRect:]):
(-[WebBaseNetscapePluginView updateAndSetWindow]):
(-[WebBaseNetscapePluginView start]):
(-[WebBaseNetscapePluginView tellQuickTimeToChill]):
(-[WebBaseNetscapePluginView viewWillMoveToWindow:]):
(-[WebBaseNetscapePluginView _viewHasMoved]):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38085 268f45cc-cd09-0410-ab3c-d52691b4dbfc