Cleanup: Remove unneeded media/ SSE2 checks and unused code. (try 2)

Cleanup: Remove unneeded media/ SSE2 checks and unused code. (try 2)

This is the media/ portion of a reverted CL: https://codereview.chromium.org/459603003/

BUG=349320
Committed: https://crrev.com/a5fa6d9c5e117a1ae09014f71245cc62a35936cf
Cr-Commit-Position: refs/heads/master@{#292294}

[Lei Zhang, 2014-08-28 00:00:14]

thestig@chromium.org changed reviewers:
+ dalecurtis@chromium.org, rileya@chromium.org

[Lei Zhang, 2014-08-28 00:00:14]

Let's have another go at it. See the difference between the patch sets for what
I changed.

[DaleCurtis, 2014-08-28 00:19:03]

lgtm

[Lei Zhang, 2014-08-28 00:21:11]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2014-08-28 00:27:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thestig@chromium.org/516543004/40001

[rileya (GONE FROM CHROMIUM), 2014-08-28 00:35:43]

lgtm

[commit-bot: I haz the power, 2014-08-28 02:03:56]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[commit-bot: I haz the power, 2014-08-28 02:12:11]

Committed patchset #3 (id:40001) as 38f9b9bb98a08eace1386c4c16df57be0aa1488e

[commit-bot: I haz the power, 2014-09-10 02:56:31]

Patchset 3 (id:??) landed as
https://crrev.com/a5fa6d9c5e117a1ae09014f71245cc62a35936cf
Cr-Commit-Position: refs/heads/master@{#292294}