Revert of discardable_memory: Using mojo IPC to replace Chrome IPC

Revert of discardable_memory: Using mojo IPC to replace Chrome IPC (patchset #23 id:490001 of https://codereview.chromium.org/2485623002/ )

Reason for revert:
Causing some failures. Example: https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Mac

Original issue's description:
> discardable_memory: Using mojo IPC to replace Chrome IPC
>
> It also moves ClientDiscardableSharedMemoryManager from ChildThreadImpl
> to RenderThreadImpl and PpapiThread
>
> BUG=654678
>
> Committed: https://crrev.com/a083f971261bcccc53b64e40c911435857ce3bfd
> Cr-Commit-Position: refs/heads/master@{#435969}

TBR=reveman@chromium.org,avi@chromium.org,dcheng@chromium.org,yzshen@chromium.org,sky@chromium.org,penghuang@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654678
Committed: https://crrev.com/23eeee43e2ba326106d915c5023335824a65d8d0
Cr-Commit-Position: refs/heads/master@{#435980}

[Ken Rockot(use gerrit already), 2016-12-02 18:19:15]

The CQ bit was checked by rockot@chromium.org

[Ken Rockot(use gerrit already), 2016-12-02 18:19:16]

Created Revert of discardable_memory: Using mojo IPC to replace Chrome IPC

[commit-bot: I haz the power, 2016-12-02 18:19:40]

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, 2016-12-02 18:20:39]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480702755885010, "parent_rev":
"09ef433b65f51909818f404d2ac727c5baa2c80f", "commit_rev":
"c438226e0c89ae32783d28b91592b0fed9b645ab"}

[commit-bot: I haz the power, 2016-12-02 18:21:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-02 18:22:54]

Description was changed from

==========
Revert of discardable_memory: Using mojo IPC to replace Chrome IPC (patchset #23
id:490001 of https://codereview.chromium.org/2485623002/ )

Reason for revert:
Causing some failures. Example:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Mac

Original issue's description:
> discardable_memory: Using mojo IPC to replace Chrome IPC
> 
> It also moves ClientDiscardableSharedMemoryManager from ChildThreadImpl
> to RenderThreadImpl and PpapiThread
> 
> BUG=654678
> 
> Committed: https://crrev.com/a083f971261bcccc53b64e40c911435857ce3bfd
> Cr-Commit-Position: refs/heads/master@{#435969}

TBR=reveman@chromium.org,avi@chromium.org,dcheng@chromium.org,yzshen@chromium...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654678
==========

to

==========
Revert of discardable_memory: Using mojo IPC to replace Chrome IPC (patchset #23
id:490001 of https://codereview.chromium.org/2485623002/ )

Reason for revert:
Causing some failures. Example:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Mac

Original issue's description:
> discardable_memory: Using mojo IPC to replace Chrome IPC
>
> It also moves ClientDiscardableSharedMemoryManager from ChildThreadImpl
> to RenderThreadImpl and PpapiThread
>
> BUG=654678
>
> Committed: https://crrev.com/a083f971261bcccc53b64e40c911435857ce3bfd
> Cr-Commit-Position: refs/heads/master@{#435969}

TBR=reveman@chromium.org,avi@chromium.org,dcheng@chromium.org,yzshen@chromium...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654678

Committed: https://crrev.com/23eeee43e2ba326106d915c5023335824a65d8d0
Cr-Commit-Position: refs/heads/master@{#435980}
==========

[commit-bot: I haz the power, 2016-12-02 18:22:55]

Patchset 1 (id:??) landed as
https://crrev.com/23eeee43e2ba326106d915c5023335824a65d8d0
Cr-Commit-Position: refs/heads/master@{#435980}