Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo

Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo (patchset #10 id:180001 of https://codereview.chromium.org/1759783003/ )

Reason for revert:
Breaks iOS GN which is apparently a tree closer despite having no CQ coverage

Original issue's description:
> [mojo-bindings] Use Watch API instead of MessagePumpMojo
>
> This removes the C++ bindings dependency on MessagePumpMojo,
> consuming the new Watch API instead.
>
> For convenience a new mojo::Watcher is added to the public
> Mojo C++ API library, and this is used by Connector.
>
> BUG=590495
> R=yzshen@chromium.org
> TBR=blundell@chromium.org for rename affecting components/message_port.gypi
> TBR=jam@chromium.org - added a missing header to new url tests
>
> Committed: https://crrev.com/d06373e7cd8b4ad725ed5c64c958f2de13585add
> Cr-Commit-Position: refs/heads/master@{#379402}

TBR=jam@chromium.org,yzshen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=590495
Committed: https://crrev.com/258f8f50d607b2b585bb18631efbe75fb5f01913
Cr-Commit-Position: refs/heads/master@{#379406}

[Ken Rockot(use gerrit already), 2016-03-05 00:13:29]

Created Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo

[commit-bot: I haz the power, 2016-03-05 00:13:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1768443004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1768443004/1

[commit-bot: I haz the power, 2016-03-05 00:14:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-05 00:16:06]

Description was changed from

==========
Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo (patchset #10
id:180001 of https://codereview.chromium.org/1759783003/ )

Reason for revert:
Breaks iOS GN which is apparently a tree closer despite having no CQ coverage

Original issue's description:
> [mojo-bindings] Use Watch API instead of MessagePumpMojo
> 
> This removes the C++ bindings dependency on MessagePumpMojo,
> consuming the new Watch API instead.
> 
> For convenience a new mojo::Watcher is added to the public
> Mojo C++ API library, and this is used by Connector.
> 
> BUG=590495
> R=yzshen@chromium.org
> TBR=blundell@chromium.org for rename affecting components/message_port.gypi
> TBR=jam@chromium.org - added a missing header to new url tests
> 
> Committed: https://crrev.com/d06373e7cd8b4ad725ed5c64c958f2de13585add
> Cr-Commit-Position: refs/heads/master@{#379402}

TBR=jam@chromium.org,yzshen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=590495
==========

to

==========
Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo (patchset #10
id:180001 of https://codereview.chromium.org/1759783003/ )

Reason for revert:
Breaks iOS GN which is apparently a tree closer despite having no CQ coverage

Original issue's description:
> [mojo-bindings] Use Watch API instead of MessagePumpMojo
>
> This removes the C++ bindings dependency on MessagePumpMojo,
> consuming the new Watch API instead.
>
> For convenience a new mojo::Watcher is added to the public
> Mojo C++ API library, and this is used by Connector.
>
> BUG=590495
> R=yzshen@chromium.org
> TBR=blundell@chromium.org for rename affecting components/message_port.gypi
> TBR=jam@chromium.org - added a missing header to new url tests
>
> Committed: https://crrev.com/d06373e7cd8b4ad725ed5c64c958f2de13585add
> Cr-Commit-Position: refs/heads/master@{#379402}

TBR=jam@chromium.org,yzshen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=590495

Committed: https://crrev.com/258f8f50d607b2b585bb18631efbe75fb5f01913
Cr-Commit-Position: refs/heads/master@{#379406}
==========

[commit-bot: I haz the power, 2016-03-05 00:16:08]

Patchset 1 (id:??) landed as
https://crrev.com/258f8f50d607b2b585bb18631efbe75fb5f01913
Cr-Commit-Position: refs/heads/master@{#379406}