Revert of Remove shell::Loader

Revert of Remove shell::Loader (patchset #3 id:40001 of https://codereview.chromium.org/1898433002/ )

Reason for revert:
It looks like this CL breaks the Windows bot (https://build.chromium.org/p/chromium/buildstatus?builder=Win&number=42453). Before this CL, mojo_shell_unittests.exe weren't being built, since the target had no source files. This CL starts to build them, which exposes the link error on Windows.

Tentatively reverting.

Original issue's description:
> Remove shell::Loader
>
> BUG=601884
> R=ben@chromium.org
>
> Committed: https://crrev.com/1de6dacd4e9c59274f2c061accfe3770f696c09b
> Cr-Commit-Position: refs/heads/master@{#387800}

TBR=ben@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601884
Committed: https://crrev.com/9dee79720763b041a6ee7aa399384bdb64bad291
Cr-Commit-Position: refs/heads/master@{#387815}

[rkc, 2016-04-16 22:44:36]

Created Revert of Remove shell::Loader

[commit-bot: I haz the power, 2016-04-16 22:44:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1899583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1899583002/1

[commit-bot: I haz the power, 2016-04-16 22:45:22]

Description was changed from

==========
Revert of Remove shell::Loader (patchset #3 id:40001 of
https://codereview.chromium.org/1898433002/ )

Reason for revert:
It looks like this CL breaks the Windows bot
(https://build.chromium.org/p/chromium/buildstatus?builder=Win&number=42453).
Before this CL, mojo_shell_unittests.exe weren't being built, since the target
had no source files. This CL starts to build them, which exposes the link error
on Windows.

Tentatively reverting.

Original issue's description:
> Remove shell::Loader
> 
> BUG=601884
> R=ben@chromium.org
> 
> Committed: https://crrev.com/1de6dacd4e9c59274f2c061accfe3770f696c09b
> Cr-Commit-Position: refs/heads/master@{#387800}

TBR=ben@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601884
==========

to

==========
Revert of Remove shell::Loader (patchset #3 id:40001 of
https://codereview.chromium.org/1898433002/ )

Reason for revert:
It looks like this CL breaks the Windows bot
(https://build.chromium.org/p/chromium/buildstatus?builder=Win&number=42453).
Before this CL, mojo_shell_unittests.exe weren't being built, since the target
had no source files. This CL starts to build them, which exposes the link error
on Windows.

Tentatively reverting.

Original issue's description:
> Remove shell::Loader
> 
> BUG=601884
> R=ben@chromium.org
> 
> Committed: https://crrev.com/1de6dacd4e9c59274f2c061accfe3770f696c09b
> Cr-Commit-Position: refs/heads/master@{#387800}

TBR=ben@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601884
==========

[commit-bot: I haz the power, 2016-04-16 22:45:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-16 22:47:08]

Description was changed from

==========
Revert of Remove shell::Loader (patchset #3 id:40001 of
https://codereview.chromium.org/1898433002/ )

Reason for revert:
It looks like this CL breaks the Windows bot
(https://build.chromium.org/p/chromium/buildstatus?builder=Win&number=42453).
Before this CL, mojo_shell_unittests.exe weren't being built, since the target
had no source files. This CL starts to build them, which exposes the link error
on Windows.

Tentatively reverting.

Original issue's description:
> Remove shell::Loader
> 
> BUG=601884
> R=ben@chromium.org
> 
> Committed: https://crrev.com/1de6dacd4e9c59274f2c061accfe3770f696c09b
> Cr-Commit-Position: refs/heads/master@{#387800}

TBR=ben@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601884
==========

to

==========
Revert of Remove shell::Loader (patchset #3 id:40001 of
https://codereview.chromium.org/1898433002/ )

Reason for revert:
It looks like this CL breaks the Windows bot
(https://build.chromium.org/p/chromium/buildstatus?builder=Win&number=42453).
Before this CL, mojo_shell_unittests.exe weren't being built, since the target
had no source files. This CL starts to build them, which exposes the link error
on Windows.

Tentatively reverting.

Original issue's description:
> Remove shell::Loader
>
> BUG=601884
> R=ben@chromium.org
>
> Committed: https://crrev.com/1de6dacd4e9c59274f2c061accfe3770f696c09b
> Cr-Commit-Position: refs/heads/master@{#387800}

TBR=ben@chromium.org,rockot@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601884

Committed: https://crrev.com/9dee79720763b041a6ee7aa399384bdb64bad291
Cr-Commit-Position: refs/heads/master@{#387815}
==========

[commit-bot: I haz the power, 2016-04-16 22:47:09]

Patchset 1 (id:??) landed as
https://crrev.com/9dee79720763b041a6ee7aa399384bdb64bad291
Cr-Commit-Position: refs/heads/master@{#387815}