Revert of Roll ANGLE.

Revert of Roll ANGLE. (patchset #2 id:20001 of https://codereview.chromium.org/1141753002/)

Reason for revert:
broke linux gn build

../../third_party/angle/src/libANGLE/Display.cpp:113:24:error: no type named 'DisplayGLX' in namespace 'rx'
        impl = new rx::DisplayGLX();
                   ~~~~^
1 error generated.
ninja: build stopped: subcommand failed.

http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20Clobber/builds/190/steps/compile/logs/stdio

Original issue's description:
> Roll ANGLE.
>
> https://chromium.googlesource.com/angle/angle/+log/b11e24..71632d
>
> BUG=484963
> BUG=483252
>
> Committed: https://crrev.com/6e8e29564f8590bff2215668d959b17075b96240
> Cr-Commit-Position: refs/heads/master@{#329727}

TBR=jmadill@chromium.org,geofflang@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=484963
Committed: https://crrev.com/b8271d08c3352611e312b28f2a45dc1917fcbc9b
Cr-Commit-Position: refs/heads/master@{#329741}

[Evan Stade, 2015-05-13 22:54:44]

Created Revert of Roll ANGLE.

[commit-bot: I haz the power, 2015-05-13 22:56:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1128913010/1

[commit-bot: I haz the power, 2015-05-13 22:58:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 22:59:49]

Patchset 1 (id:??) landed as
https://crrev.com/b8271d08c3352611e312b28f2a45dc1917fcbc9b
Cr-Commit-Position: refs/heads/master@{#329741}

[Jamie Madill, 2015-05-14 12:39:57]

On 2015/05/13 22:59:49, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/b8271d08c3352611e312b28f2a45dc1917fcbc9b
> Cr-Commit-Position: refs/heads/master@{#329741}

LGTM. I guess there's no try bot for this?