Fix emoji font fallback logic on Windows

Fix emoji font fallback logic on Windows

Fix handling of emojiFonts in getFontBasedOnUnicodeBlock, the emojiFonts
field was incorrectly not marked as static and thus would only be set on
the very first invocation of the method.

TEST=fast/text/emoji-font-fallback-win.html
BUG=516580
R=wkorman@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201495

[eae, 2015-08-29 00:23:09]

eae@chromium.org changed reviewers:
+ wkorman@chromium.org

[wkorman, 2015-08-29 00:29:26]

The CQ bit was checked by wkorman@chromium.org

[wkorman, 2015-08-29 00:29:26]

lgtm

[commit-bot: I haz the power, 2015-08-29 00:29:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1312903004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1312903004/1

[commit-bot: I haz the power, 2015-08-29 03:17:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-29 03:17:23]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[eae, 2015-08-31 18:35:29]

The CQ bit was checked by eae@chromium.org

[eae, 2015-08-31 18:35:30]

The patchset sent to the CQ was uploaded after l-g-t-m from wkorman@chromium.org
Link to the patchset: https://codereview.chromium.org/1312903004/#ps20001
(title: " ")

[commit-bot: I haz the power, 2015-08-31 18:35:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1312903004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1312903004/20001

[commit-bot: I haz the power, 2015-08-31 19:29:24]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201495