Revert of clang/win: Disable precompiled headers.

Revert of clang/win: Disable precompiled headers. (patchset #1 id:1 of https://codereview.chromium.org/1904193002/ )

Reason for revert:
rnk might have fixed this upstream, let's give it a try :-)

Original issue's description:
> clang/win: Disable precompiled headers.
>
> The protobuf3 roll triggered a compiler crash in the pch codepath.
>
> BUG=605570
> R=hans@chromium.org
>
> Committed: https://crrev.com/589ef6b6a9d60b21d6c78b92887de1b9d04b7e0f
> Cr-Commit-Position: refs/heads/master@{#388887}

TBR=hans@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=605570
Committed: https://crrev.com/8b6d787f07401e9c72a5858a00a396981bbc018d
Cr-Commit-Position: refs/heads/master@{#389213}

[Nico, 2016-04-22 19:41:10]

Created Revert of clang/win: Disable precompiled headers.

[commit-bot: I haz the power, 2016-04-22 19:41:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1914673002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1914673002/1

[commit-bot: I haz the power, 2016-04-22 19:42:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-22 19:51:52]

Description was changed from

==========
Revert of clang/win: Disable precompiled headers. (patchset #1 id:1 of
https://codereview.chromium.org/1904193002/ )

Reason for revert:
rnk might have fixed this upstream, let's give it a try :-)

Original issue's description:
> clang/win: Disable precompiled headers.
> 
> The protobuf3 roll triggered a compiler crash in the pch codepath.
> 
> BUG=605570
> R=hans@chromium.org
> 
> Committed: https://crrev.com/589ef6b6a9d60b21d6c78b92887de1b9d04b7e0f
> Cr-Commit-Position: refs/heads/master@{#388887}

TBR=hans@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=605570
==========

to

==========
Revert of clang/win: Disable precompiled headers. (patchset #1 id:1 of
https://codereview.chromium.org/1904193002/ )

Reason for revert:
rnk might have fixed this upstream, let's give it a try :-)

Original issue's description:
> clang/win: Disable precompiled headers.
>
> The protobuf3 roll triggered a compiler crash in the pch codepath.
>
> BUG=605570
> R=hans@chromium.org
>
> Committed: https://crrev.com/589ef6b6a9d60b21d6c78b92887de1b9d04b7e0f
> Cr-Commit-Position: refs/heads/master@{#388887}

TBR=hans@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=605570

Committed: https://crrev.com/8b6d787f07401e9c72a5858a00a396981bbc018d
Cr-Commit-Position: refs/heads/master@{#389213}
==========

[commit-bot: I haz the power, 2016-04-22 19:51:53]

Patchset 1 (id:??) landed as
https://crrev.com/8b6d787f07401e9c72a5858a00a396981bbc018d
Cr-Commit-Position: refs/heads/master@{#389213}