Revert of Move some basic early process init into Service Manager

Revert of Move some basic early process init into Service Manager (patchset #5 id:220001 of https://codereview.chromium.org/2613653003/ )

Reason for revert:
Introduced crashes of webkit_tests on Mac.

BUG=703465
Original issue's description:
> Move some basic early process init into Service Manager
> 
> Introduces the beginnings of an embedder API for the Service Manager,
> consisting of a single entry point (service_manager::Main) which in
> turn delegates to its embedder for arbitrary initialization and
> process execution logic.
> 
> This is the first of several incremental steps to remove content from
> the generic process startup flow. Future patches will rework various
> main entry points to go through service_manager::Main directly, rather
> than going ContentMain -> service_manager::Main.
> 
> This will also allow us to introduce new process types which run the
> Service Manager or arbitrary services directly without touching any
> part of content.
> 
> BUG=654986
> 
> Review-Url: https://codereview.chromium.org/2613653003
> Cr-Commit-Position: refs/heads/master@{#458252}
> Committed: https://chromium.googlesource.com/chromium/src/+/c6026704ff452d402924ce2d88b0168baf227b1e

TBR=jam@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654986
Review-Url: https://codereview.chromium.org/2763883002
Cr-Commit-Position: refs/heads/master@{#458278}
Committed: https://chromium.googlesource.com/chromium/src/+/1c92dd551abe4a1581981b945076719dff7b4422

[horo, 2017-03-21 02:04:34]

The CQ bit was checked by horo@chromium.org

[horo, 2017-03-21 02:04:35]

Created Revert of Move some basic early process init into Service Manager

[commit-bot: I haz the power, 2017-03-21 02:05:15]

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 02:06:35]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490061874763370, "parent_rev":
"1432276fb82ae8e9b732faa03ab65f35d686017f", "commit_rev":
"d9841ef23a8ca3509c4b61f23704852740e4f240"}

[commit-bot: I haz the power, 2017-03-21 02:11:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490061874763370, "parent_rev":
"b3a64fe5febbf538bb12d356728c3d5dba119ca7", "commit_rev":
"1c92dd551abe4a1581981b945076719dff7b4422"}

[commit-bot: I haz the power, 2017-03-21 02:12:03]

Description was changed from

==========
Revert of Move some basic early process init into Service Manager (patchset #5
id:220001 of https://codereview.chromium.org/2613653003/ )

Reason for revert:
Introduced crashes of webkit_tests on Mac.

BUG=703465



Original issue's description:
> Move some basic early process init into Service Manager
> 
> Introduces the beginnings of an embedder API for the Service Manager,
> consisting of a single entry point (service_manager::Main) which in
> turn delegates to its embedder for arbitrary initialization and
> process execution logic.
> 
> This is the first of several incremental steps to remove content from
> the generic process startup flow. Future patches will rework various
> main entry points to go through service_manager::Main directly, rather
> than going ContentMain -> service_manager::Main.
> 
> This will also allow us to introduce new process types which run the
> Service Manager or arbitrary services directly without touching any
> part of content.
> 
> BUG=654986
> 
> Review-Url: https://codereview.chromium.org/2613653003
> Cr-Commit-Position: refs/heads/master@{#458252}
> Committed:
https://chromium.googlesource.com/chromium/src/+/c6026704ff452d402924ce2d88b0...

TBR=jam@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654986
==========

to

==========
Revert of Move some basic early process init into Service Manager (patchset #5
id:220001 of https://codereview.chromium.org/2613653003/ )

Reason for revert:
Introduced crashes of webkit_tests on Mac.

BUG=703465



Original issue's description:
> Move some basic early process init into Service Manager
> 
> Introduces the beginnings of an embedder API for the Service Manager,
> consisting of a single entry point (service_manager::Main) which in
> turn delegates to its embedder for arbitrary initialization and
> process execution logic.
> 
> This is the first of several incremental steps to remove content from
> the generic process startup flow. Future patches will rework various
> main entry points to go through service_manager::Main directly, rather
> than going ContentMain -> service_manager::Main.
> 
> This will also allow us to introduce new process types which run the
> Service Manager or arbitrary services directly without touching any
> part of content.
> 
> BUG=654986
> 
> Review-Url: https://codereview.chromium.org/2613653003
> Cr-Commit-Position: refs/heads/master@{#458252}
> Committed:
https://chromium.googlesource.com/chromium/src/+/c6026704ff452d402924ce2d88b0...

TBR=jam@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654986

Review-Url: https://codereview.chromium.org/2763883002
Cr-Commit-Position: refs/heads/master@{#458278}
Committed:
https://chromium.googlesource.com/chromium/src/+/1c92dd551abe4a1581981b945076...
==========

[commit-bot: I haz the power, 2017-03-21 02:12:04]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/1c92dd551abe4a1581981b945076...