Remove a graceful shutdown sequence from TestingPlatformSupport

Remove a graceful shutdown sequence from TestingPlatformSupport

As discussed in blink-dev@ (https://groups.google.com/a/chromium.org/d/topic/blink-dev/kk4VX0xRB7I/discussion)
and platform-architecture-dev@ (https://groups.google.com/a/chromium.org/d/topic/platform-architecture-dev/Zc12k91NTFk/discussion),
there is no reason we have to shut down the renderer gracefully.
It's just causing use-after-free bugs and wasting performance.
This CL removes a graceful shutdown sequence from TestingPlatformSupport.

BUG=639244
Committed: https://crrev.com/bc13dbaa3f99577e8929e27283d7929d8f844d03
Cr-Commit-Position: refs/heads/master@{#414307}

[haraken, 2016-08-25 01:56:42]

haraken@chromium.org changed reviewers:
+ tkent@chromium.org

[haraken, 2016-08-25 01:56:43]

PTAL

[tkent, 2016-08-25 02:18:35]

lgtm.
After landing this, please watch if LSan bot is happy.

[haraken, 2016-08-25 02:23:22]

> After landing this, please watch if LSan bot is happy.

Sure.

[haraken, 2016-08-25 02:23:24]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2016-08-25 02:24:52]

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, 2016-08-25 04:17:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-25 04:20:35]

Description was changed from

==========
Remove a graceful shutdown sequence from TestingPlatformSupport

As discussed in blink-dev@
(https://groups.google.com/a/chromium.org/d/topic/blink-dev/kk4VX0xRB7I/discus...)
and platform-architecture-dev@
(https://groups.google.com/a/chromium.org/d/topic/platform-architecture-dev/Zc...),
there is no reason we have to shut down the renderer gracefully.
It's just causing use-after-free bugs and wasting performance.
This CL removes a graceful shutdown sequence from TestingPlatformSupport.

BUG=639244
==========

to

==========
Remove a graceful shutdown sequence from TestingPlatformSupport

As discussed in blink-dev@
(https://groups.google.com/a/chromium.org/d/topic/blink-dev/kk4VX0xRB7I/discus...)
and platform-architecture-dev@
(https://groups.google.com/a/chromium.org/d/topic/platform-architecture-dev/Zc...),
there is no reason we have to shut down the renderer gracefully.
It's just causing use-after-free bugs and wasting performance.
This CL removes a graceful shutdown sequence from TestingPlatformSupport.

BUG=639244

Committed: https://crrev.com/bc13dbaa3f99577e8929e27283d7929d8f844d03
Cr-Commit-Position: refs/heads/master@{#414307}
==========

[commit-bot: I haz the power, 2016-08-25 04:20:36]

Patchset 1 (id:??) landed as
https://crrev.com/bc13dbaa3f99577e8929e27283d7929d8f844d03
Cr-Commit-Position: refs/heads/master@{#414307}