Revert of Add the ability to build Chrome tools to the Win Clang build script.

Revert of Add the ability to build Chrome tools to the Win Clang build script. (patchset #2 id:20001 of https://codereview.chromium.org/1068603002/)

Reason for revert:
Broke all bots on http://build.chromium.org/p/chromium.fyi/console?category=win%20clang , they fail with:

________ running 'C:\b\depot_tools\python276_bin\python.exe src/tools/clang/scripts/update.py --if-needed' in 'C:\b\build\slave\CrWinClang\build'
usage: update.py [-h] [--no-clobber] [--tools [TOOLS [TOOLS ...]]]
update.py: error: unrecognized arguments: --if-needed

Probably easy to fix (just add a dummy --if-needed parameter to argparse), but reverting to get that waterfall back to green.

Original issue's description:
> Add the ability to build Chrome tools to the Win Clang build script.
>
> BUG=424436, 467287
>
> Committed: https://crrev.com/475949d9430b6a759ce759f2133dd3a1577d0d0b
> Cr-Commit-Position: refs/heads/master@{#324089}

TBR=hans@chromium.org,dcheng@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=424436, 467287
Committed: https://crrev.com/d6aece7c6748553aa11b9dbacd27b5ec4d2d363c
Cr-Commit-Position: refs/heads/master@{#324138}

[Nico, 2015-04-07 22:36:47]

Created Revert of Add the ability to build Chrome tools to the Win Clang build
script.

[commit-bot: I haz the power, 2015-04-07 22:38:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1063273002/1

[commit-bot: I haz the power, 2015-04-07 22:40:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-07 22:41:02]

Patchset 1 (id:??) landed as
https://crrev.com/d6aece7c6748553aa11b9dbacd27b5ec4d2d363c
Cr-Commit-Position: refs/heads/master@{#324138}