Revert of Add output reference to gen written files.

Revert of Add output reference to gen written files. (patchset #3 id:40001 of https://codereview.chromium.org/1220223002/)

Reason for revert:
Looks like this doesn't quite work on Windows:

http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_ng/builds/21206/steps/compile%20%28with%20patch%29/logs/stdio

Original issue's description:
> Add output reference to gen written files.
>
> By adding the outputs written at gn gen time to the build.ninja representation the build tool (ninja) can know how to recreate them if and when necessary.
>
> For example, if one or more of the <blah>.tmp files is removed, even as part of an entire hierarchy/subtree currently the build fails because ninja does not know how to re-make it.
>
> BUG=469621
> TEST=Build time only. See https://code.google.com/p/chromium/issues/detail?id=469621#c3
>
> Committed: https://crrev.com/517ac52f86903beb206b19e6ddeedbc709b253a1
> Cr-Commit-Position: refs/heads/master@{#338929}

TBR=brettw@chromium.org,petermayo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=469621
Committed: https://crrev.com/61fb6826c8e7b9a31c260cb3698258e4fad5b33b
Cr-Commit-Position: refs/heads/master@{#340596}

[Dirk Pranke, 2015-07-27 23:08:35]

Created Revert of Add output reference to gen written files.

[commit-bot: I haz the power, 2015-07-27 23:09:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1255113004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1255113004/1

[commit-bot: I haz the power, 2015-07-27 23:10:38]

Committed patchset #1 (id:1)

[Peter Mayo, 2015-07-27 23:10:47]

LGTM

Sigh.

[commit-bot: I haz the power, 2015-07-27 23:11:24]

Patchset 1 (id:??) landed as
https://crrev.com/61fb6826c8e7b9a31c260cb3698258e4fad5b33b
Cr-Commit-Position: refs/heads/master@{#340596}

[Dirk Pranke, 2015-07-27 23:12:37]

On 2015/07/27 23:11:24, commit-bot: I haz the power wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/61fb6826c8e7b9a31c260cb3698258e4fad5b33b
> Cr-Commit-Position: refs/heads/master@{#340596}

Whoops. That probably shouldn't have been TBR, NOPRESUBMIT, etc. ... hopefully
it doesn't break things.

[Peter Mayo, 2015-07-28 22:18:36]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1252403005/ by petermayo@chromium.org.

The reason for reverting is: Start Reland Issue.