Revert of Add installer_util_unittests to the GN windows build

Revert of Add installer_util_unittests to the GN windows build (patchset #5 id:80001 of https://codereview.chromium.org/1062743006/)

Reason for revert:
Compilation errors that look related to the installer_util_strings.rc move: http://build.chromium.org/p/chromium/builders/Win/builds/31460

Original issue's description:
> Add installer_util_unittests to the GN windows build
>
> This fixes some C++ Warnings on Windows to avoid having to add suppressions to the GN build.
>
> Moves the generated strings header to the same place in the gen tree as it is in the source tree. Update includes.
>
> CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:android_chromium_gn_compile_dbg,android_chromium_gn_compile_rel;tryserver.chromium.win:win8_chromium_gn_rel,win8_chromium_gn_dbg;tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg
>
> Committed: https://crrev.com/cb55755a09b9e2d8c5b05b7a4ad2ff8631e15b13
> Cr-Commit-Position: refs/heads/master@{#327790}

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

Committed: https://crrev.com/b356c585d9f6841dcc7df05b8e7cfad0a2b4bdf6
Cr-Commit-Position: refs/heads/master@{#327799}

[rickyz (no longer on Chrome), 2015-04-30 21:46:00]

Created Revert of Add installer_util_unittests to the GN windows build

[commit-bot: I haz the power, 2015-04-30 21:47:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1116263002/1

[Dirk Pranke, 2015-04-30 21:50:10]

lgtm

[commit-bot: I haz the power, 2015-04-30 21:55:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-30 21:56:58]

Patchset 1 (id:??) landed as
https://crrev.com/b356c585d9f6841dcc7df05b8e7cfad0a2b4bdf6
Cr-Commit-Position: refs/heads/master@{#327799}