Remove isRenderingReady.

Remove isRenderingReady.

All this method did was check if imports were loaded, and sky's parser
will wait on imports anyway, so there's no reason to block rendering
on imports as they'll likely be at the top of the document and stop
the rest of the page from being appended or rendered.

Sky apps will probably also want more control over rendering and not
want the old school web style of incremental rendering.

R=abarth@chromium.org, ojan@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/db6850fada0dc3ce132b62cf80e699d764ce1420

[abarth-chromium, 2015-01-13 04:45:59]

abarth@chromium.org changed reviewers:
+ abarth@chromium.org

[abarth-chromium, 2015-01-13 04:46:00]

lgtm

[esprehn, 2015-01-13 06:11:07]

Committed patchset #1 (id:1) manually as
db6850fada0dc3ce132b62cf80e699d764ce1420 (presubmit successful).