Update *-focus-by-mouse-then-keydown.html tests to be repaint tests

These tests worked previously but no longer work in our layouttest
repaint infrastructure. These tests intended to do the following:
1) Paint the page
2) Click a form control element (no focus ring)
3) Press a key (causing a focus ring)
4) Paint the page again, this time with the focus ring

The tests actually did the following:
1) Click a form control element (no focus ring)
2) Press a key (causing a focus ring)
3) Paint the page for the first time, including focus ring

This patch updates these tests to be repaint tests. I manually verified
these tests fail if HTMLFormControlElement.cpp does not call
renderer()->setShouldDoFullPaintInvalidation(true). The repaint tests
will have platform-specific results so NeedsRebaseline has been used,
but I uploaded my OSX10.9.4/highdpi results to make the review easier.

The checkbox-focus-by-mouse-then-keydown test is already listed in
FlakyTests (and is flaky [1]) so this was removed from TestExpectations.

[1] http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fforms%2Fcheckbox%2Fcheckbox-focus-by-mouse-then-keydown.html

BUG=407961

Review URL: https://codereview.chromium.org/504343004

git-svn-id: svn://svn.chromium.org/blink/trunk@180940 bbb929c8-8fbe-4397-9dbb-9b2b20218538