Remove repaint.js from svg tests that pass without it

This set of tests all attempt to do a "repaint" test but aren't about
painting at all.  If the display() call from repaint.js is removed,
these tests all continue to pass, indicating that their output pixels
are not affected by the WebTestProxy::displayRepaintMask that covers
part of the screen in grey to indicate what has changed.

Because of this, it also means that they are not a good candidate for a
true text-based repaint rect, as they are either spit out no repaints or
full-screen repaints, depending on when paint rect tracking begins.

My conclusion is that these tests are really trying to test some
incremental layout- or style-related change, and so merely forcing a
style/layout recalc, tickling some property, and outputting the final
test pixels is a sufficient test.

BUG=345027

Review URL: https://codereview.chromium.org/208583004

git-svn-id: svn://svn.chromium.org/blink/trunk@170134 bbb929c8-8fbe-4397-9dbb-9b2b20218538