Revert of Reenable WebView KeySystem tests

Revert of Reenable WebView KeySystem tests (patchset #1 id:1 of https://codereview.chromium.org/2760643003/ )

Reason for revert:
This is still failing, see https://build.chromium.org/p/chromium.android/builders/Marshmallow%2064%20bit%20Tester?numbuilds=200

Original issue's description:
> Reenable WebView KeySystem tests
> 
> Tests were failing due to copies of //media/base/android code included in
> multiple libraries.
> 
> BUG=701916
> TEST=tests pass with component builds on both K and M devices
> 
> Review-Url: https://codereview.chromium.org/2760643003
> Cr-Commit-Position: refs/heads/master@{#458155}
> Committed: https://chromium.googlesource.com/chromium/src/+/09702159bbbe183dee5baa93f14b2b0c53ac9efe

TBR=sgurun@chromium.org,xhwang@chromium.org,jrummell@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=701916

[jam1, 2017-03-21 00:13:39]

The CQ bit was checked by jam@google.com

[jam1, 2017-03-21 00:13:40]

Created Revert of Reenable WebView KeySystem tests

[commit-bot: I haz the power, 2017-03-21 00:14:30]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-21 00:14:31]

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

[commit-bot: I haz the power, 2017-03-21 00:14:31]

No L-G-T-M from a valid reviewer yet.
CQ run can only be started once the patch has received an L-G-T-M from a full
committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,_not_ a
full super star committer.
Committers are members of the group "project-chromium-committers".
Note that this has nothing to do with OWNERS files.

[xhwang, 2017-03-21 00:15:17]

lgtm

[sgurun-gerrit only, 2017-03-21 22:01:50]

On 2017/03/21 00:15:17, xhwang_slow wrote:
> lgtm

lgtm

[xhwang, 2017-04-19 06:44:02]

To avoid confusion, the "revert" was landed in
https://codereview.chromium.org/2766483002/

So I assume this CL is not needed anymore and can be closed?