Remove subpixel hacks from RenderTreeAsText

RenderTreeAsText currently reports the enclosing rect of an object
rather than the more precise logical location and size.
Remove this hack and update the test expectations accordingly.

BUG=263879
R=leviw@chromium.org

Review URL: https://codereview.chromium.org/19578006

git-svn-id: svn://svn.chromium.org/blink/trunk@154918 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Skip super-flaky test webmidi/requestmidiaccess.html

The test was already marked Crash/Pass, and after http://crrev.com/213644
it's also Failing. I don't think it's worth running this test until it's
fixed (tracked by attached bug).

TBR=toyoshim@chromium.org
BUG=256226

Review URL: https://codereview.chromium.org/20380002

git-svn-id: svn://svn.chromium.org/blink/trunk@154919 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rebaseline fast/images/imagemap-case.html after r154917

The new results included the two "success" lines, which looks like a better
result than the old ones.

TBR=schenney@chromium.org
BUG=257352

Review URL: https://codereview.chromium.org/20376002

git-svn-id: svn://svn.chromium.org/blink/trunk@154920 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove no-longer-flaky expectations

TBR=haraken

Review URL: https://codereview.chromium.org/20386002

git-svn-id: svn://svn.chromium.org/blink/trunk@154921 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Make window-onerror-10.html not flaky

This newly-added test triggers exceptions in an onload handler and a setTimeout,
but the ordering of those two was not consistent.

Now the setTimeout is called from the onload handler, ensuring that one always
runs before the other.

TBR=mkwst@chromium.org

Review URL: https://codereview.chromium.org/20377003

git-svn-id: svn://svn.chromium.org/blink/trunk@154922 bbb929c8-8fbe-4397-9dbb-9b2b20218538