Revert of Update SplitString calls to new form

Revert of Update SplitString calls to new form (patchset #5 id:80001 of https://codereview.chromium.org/1272823003/ )

Reason for revert:
Caused Blink layout test failures in media/encrypted-media/encrypted-media-requestmediakeysystemaccess.html :

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=media%2Fencrypted-media%2Fencrypted-media-requestmediakeysystemaccess.html

Original issue's description:
> Update SplitString calls to new form
>
> Uses the new form for most (but not quite all) of the remaining users of the old form.
>
> Changes media mime util codec list parsing to expect no result from the string "," rather than two empty strings. The old SplitString call had a special case where if the input was empty, it would return empty, but if it had one split character, it would return two empty strings as results.
>
> The new one lets you choose but the options are either (1) empty string -> one empty string and "," -> two empty strings, or (2) map both to no results for when you don't want empty results. I'm pretty sure media codec parsing actually wants the latter behavior, so I updated the call to discard empty results and MimeUtilTest.ParseCodecString is updated.
>
> Committed: https://crrev.com/0aa7c64253cca8b636d52d1d01d94f96ab9c13fa
> Cr-Commit-Position: refs/heads/master@{#342238}

TBR=sky@chromium.org,dalecurtis@chromium.org,brettw@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/c4afb05f67511e980cd13c021abf26e04b902977
Cr-Commit-Position: refs/heads/master@{#342257}

[Peter Kasting, 2015-08-07 01:26:16]

Created Revert of Update SplitString calls to new form

[commit-bot: I haz the power, 2015-08-07 01:27:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1278973003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1278973003/1

[commit-bot: I haz the power, 2015-08-07 01:29:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-07 01:30:38]

Patchset 1 (id:??) landed as
https://crrev.com/c4afb05f67511e980cd13c021abf26e04b902977
Cr-Commit-Position: refs/heads/master@{#342257}

[brettw, 2015-08-07 03:27:29]

LGTM, thanks