Update SplitString calls to new form

Update SplitString calls to new form

Uses the new form for most (but not quite all) of the remaining users of the old form.

Reland of https://codereview.chromium.org/1272823003 but with no changes to the way media parses codec lists. The previous landing attempted to simplify some handling but there are layout tests that expect the old behavior, and I'm not qualified to tell if it's OK to change.

TBR=sky

Committed: https://crrev.com/26dab8f049217794bd73a230ea567021adc09672
Cr-Commit-Position: refs/heads/master@{#342489}

[brettw, 2015-08-07 23:11:19]

brettw@chromium.org changed reviewers:
+ sky@chromium.org

[brettw, 2015-08-07 23:11:19]

Original landing is patch set 1, new one is patch set 2.

[brettw, 2015-08-07 23:11:25]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-08-07 23:13:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1274123003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1274123003/20001

[commit-bot: I haz the power, 2015-08-08 00:28:56]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-08 00:29:39]

Patchset 2 (id:??) landed as
https://crrev.com/26dab8f049217794bd73a230ea567021adc09672
Cr-Commit-Position: refs/heads/master@{#342489}