Simplify flakiness dashboard test list handling.

-Remove the GTEST_MODIFIERS stuff. The modifiers are now stripped
on the gtest side, so we don't need that here.
-Accept newlines and multiple spaces. This makes copy-paste
from other locations simpler.
-Don't use isCrossBuilderView in deciding whether to show the builder
or the text name. I saw this break once and couldn't reproduce it,
but the new code is also better because it doesn't rely on global state.

R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/19888002

git-svn-id: svn://svn.chromium.org/blink/trunk@154684 bbb929c8-8fbe-4397-9dbb-9b2b20218538