Some tiled drawing tests use scalePageBy() incorrectly
https://bugs.webkit.org/show_bug.cgi?id=109336

Rubber-stamped by Simon Fraser.

scalePageBy takes (scale, x, y). Some of the tiled drawing tests are incorrectly handing them (scale, scale).
Adjust the tests and the expected results.

* platform/mac-wk2/tiled-drawing/fixed-background/fixed-body-background-zoomed.html:
* platform/mac-wk2/tiled-drawing/fixed/four-bars-zoomed-expected.txt:
* platform/mac-wk2/tiled-drawing/fixed/four-bars-zoomed.html:
* platform/mac-wk2/tiled-drawing/tiled-drawing-zoom-expected.txt:
* platform/mac-wk2/tiled-drawing/tiled-drawing-zoom-scrolled.html:
* platform/mac-wk2/tiled-drawing/tiled-drawing-zoom.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142338 268f45cc-cd09-0410-ab3c-d52691b4dbfc