REGRESSION (r147373): Auto-sizing doesn't always respect minimum width changes
https://bugs.webkit.org/show_bug.cgi?id=113947
<rdar://problem/13579024>

Reviewed by Anders Carlsson.

Reset the FrameView size to the minimum auto-sizing size
before performing auto-sizing. We were already resetting the height,
but not the width, instead using the FrameView's current width.

This means that changing the minimum width without also manually
resizing the FrameView will never see the width change.

Auto-sizing tests are not working on Mac yet.

* page/FrameView.cpp:
(WebCore::FrameView::autoSizeIfEnabled):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147664 268f45cc-cd09-0410-ab3c-d52691b4dbfc