Revert of Ipclist fixes.

Revert of Ipclist fixes. (patchset #2 id:20001 of https://codereview.chromium.org/848453003/)

Reason for revert:
The review doesn't show it, but this added back third_party/libc++(abi) for some reason: https://chromium.googlesource.com/chromium/src/+/faf8b453fa03869b3109258702ca7cf7b8157f5b

This was moved elsewhere in https://codereview.chromium.org/788063003 and it being back causes all kinds of things, for example me being unable to run `git cl upload`. Please reland this without adding back libc++.

Original issue's description:
> Ipclist fixes.
> 
> 1. Make it work with Windows.
> 2. Remove non-existent messages.
> 3. Use _generator.h files where possible, e.g. adds missing extension_utility_messages.h.
> 
> R=gunsch@chromium.org, tsepez@chromium.org
> TBR=ttuttle@chromium.org
> BUG=450268
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/faf8b453fa03869b3109258702ca7cf7b8157f5b

TBR=tsepez@chromium.org,gunsch@chromium.org,jar@chromium.org,ttuttle@chromium.org,inferno@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=450268

[Nico, 2015-01-21 21:14:12]

Created Revert of Ipclist fixes.

[Nico, 2015-01-21 21:14:59]

The CQ bit was unchecked by thakis@chromium.org

[Nico, 2015-01-21 21:15:14]

Bleh, looks like this isn't reverting the libc++ bits. Reverting manually…

[Deprecated (see juliatuttle), 2015-01-30 19:27:31]

On 2015/01/21 21:15:14, Nico wrote:
> Bleh, looks like this isn't reverting the libc++ bits. Reverting manually…

Can you close this change if it's not going to land?

[Nico, 2015-01-30 19:31:08]

On 2015/01/30 19:27:31, ttuttle wrote:
> On 2015/01/21 21:15:14, Nico wrote:
> > Bleh, looks like this isn't reverting the libc++ bits. Reverting manually…
> 
> Can you close this change if it's not going to land?

Sure, done. (If this bothers you, I think you can do this yourself too. I tend
to not clean up old stuff I ended up not using, as a quick look at
https://codereview.chromium.org/user/thakis@chromium.org will show you ;-) )