Revert of Making the Mojo Channel Messages legacy mode dynamic.

Revert of Making the Mojo Channel Messages legacy mode dynamic. (patchset #4 id:120001 of https://codereview.chromium.org/2749853003/ )

Reason for revert:
Breaks the Chrome PFQ bot. Will need to sync with a change to the Arc++ code before landing this.

Original issue's description:
> Making the Mojo Channel Messages legacy mode dynamic.
> 
> The mojo::edk::Channel::Message class uses a compile flag to determine
> whether to use the legacy or normal mode (legacy mode is used to keep
> backward compatibility between Arc++ and ChromeOS).
> Making that flag dynamically set on the embedder so that the default is
> now normal mode on Android. This is going to be used for adding
> Parcelable support on mojo Android (where we'll need the normal
> Message's header to include the parcelables).
> 
> BUG=699311
> 
> Review-Url: https://codereview.chromium.org/2749853003
> Cr-Commit-Position: refs/heads/master@{#457549}
> Committed: https://chromium.googlesource.com/chromium/src/+/f2be81a465a7b2ef07b3667f83de1009206acace

TBR=rockot@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=699311
Review-Url: https://codereview.chromium.org/2765673002
Cr-Commit-Position: refs/heads/master@{#458271}
Committed: https://chromium.googlesource.com/chromium/src/+/8726a7e2f31aba4bec3de517134e3c8edc512349

[Jay Civelli, 2017-03-21 00:07:13]

The CQ bit was checked by jcivelli@chromium.org

[Jay Civelli, 2017-03-21 00:07:13]

Created Revert of Making the Mojo Channel Messages legacy mode dynamic.

[commit-bot: I haz the power, 2017-03-21 00:08:06]

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 01:43:08]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490054833673390, "parent_rev":
"19ae4d04c84aa9453c35e3aa8a470045a3f675d1", "commit_rev":
"8726a7e2f31aba4bec3de517134e3c8edc512349"}

[commit-bot: I haz the power, 2017-03-21 01:44:26]

Description was changed from

==========
Revert of Making the Mojo Channel Messages legacy mode dynamic. (patchset #4
id:120001 of https://codereview.chromium.org/2749853003/ )

Reason for revert:
Breaks the Chrome PFQ bot. Will need to sync with a change to the Arc++ code
before landing this.

Original issue's description:
> Making the Mojo Channel Messages legacy mode dynamic.
> 
> The mojo::edk::Channel::Message class uses a compile flag to determine
> whether to use the legacy or normal mode (legacy mode is used to keep
> backward compatibility between Arc++ and ChromeOS).
> Making that flag dynamically set on the embedder so that the default is
> now normal mode on Android. This is going to be used for adding
> Parcelable support on mojo Android (where we'll need the normal
> Message's header to include the parcelables).
> 
> BUG=699311
> 
> Review-Url: https://codereview.chromium.org/2749853003
> Cr-Commit-Position: refs/heads/master@{#457549}
> Committed:
https://chromium.googlesource.com/chromium/src/+/f2be81a465a7b2ef07b3667f83de...

TBR=rockot@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=699311
==========

to

==========
Revert of Making the Mojo Channel Messages legacy mode dynamic. (patchset #4
id:120001 of https://codereview.chromium.org/2749853003/ )

Reason for revert:
Breaks the Chrome PFQ bot. Will need to sync with a change to the Arc++ code
before landing this.

Original issue's description:
> Making the Mojo Channel Messages legacy mode dynamic.
> 
> The mojo::edk::Channel::Message class uses a compile flag to determine
> whether to use the legacy or normal mode (legacy mode is used to keep
> backward compatibility between Arc++ and ChromeOS).
> Making that flag dynamically set on the embedder so that the default is
> now normal mode on Android. This is going to be used for adding
> Parcelable support on mojo Android (where we'll need the normal
> Message's header to include the parcelables).
> 
> BUG=699311
> 
> Review-Url: https://codereview.chromium.org/2749853003
> Cr-Commit-Position: refs/heads/master@{#457549}
> Committed:
https://chromium.googlesource.com/chromium/src/+/f2be81a465a7b2ef07b3667f83de...

TBR=rockot@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=699311

Review-Url: https://codereview.chromium.org/2765673002
Cr-Commit-Position: refs/heads/master@{#458271}
Committed:
https://chromium.googlesource.com/chromium/src/+/8726a7e2f31aba4bec3de517134e...
==========

[commit-bot: I haz the power, 2017-03-21 01:44:27]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/8726a7e2f31aba4bec3de517134e...