Revert of Un-nest configs in GN files.

Revert of Un-nest configs in GN files. (patchset #3 id:40001 of https://codereview.chromium.org/1318823008/ )

Reason for revert:
This breaks why these configs exist in the first place and seriously breaks the clang/win gn build (which is what these configs exist for).

Original issue's description:
> Un-nest configs in GN files.
>
> People sometimes nest targets or configs, usually with the assumption that this limits the visibility of a config to within a target. But this nesting provides no visibility restrictions over declaring it outside of a block.
>
> Un-nest for clarity.
>
> Committed: https://crrev.com/4af2eac8e84692d94f88504ab6e0b244b88dddcb
> Cr-Commit-Position: refs/heads/master@{#346461}

TBR=dpranke@chromium.org,brettw@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/0cb5abbf230f3c30e3499d4e787f059ed723dd3c
Cr-Commit-Position: refs/heads/master@{#346695}

[Nico, 2015-09-01 18:28:35]

Created Revert of Un-nest configs in GN files.

[commit-bot: I haz the power, 2015-09-01 18:29:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1316843006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1316843006/1

[commit-bot: I haz the power, 2015-09-01 18:30:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-01 18:31:04]

Patchset 1 (id:??) landed as
https://crrev.com/0cb5abbf230f3c30e3499d4e787f059ed723dd3c
Cr-Commit-Position: refs/heads/master@{#346695}

[Dirk Pranke, 2015-09-01 18:39:02]

lgtm