Remove unused gn tool script.

Remove unused gn tool script.

No intended behavior change.

BUG=
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288728

[Nico, 2014-08-10 18:28:59]

There's another copy of this script in
native_client/build/toolchain/android/find_android_compiler.py . In general, a
lot of the gn build stuff seems duplicated in the native_client side. Will this
deletion get magically mirrored there somehow?

[brettw, 2014-08-11 16:35:19]

As I mentioned in the other core review, nothing automatic happens. Come chat
with me in person if you're interested in how I think this should work.

[brettw, 2014-08-11 16:35:25]

lgtm

[Nico, 2014-08-11 16:38:12]

(cc'ing noel so he can merge this to nacl)

[Nico, 2014-08-11 16:38:19]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-08-11 16:39:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thakis@chromium.org/461463002/1

[commit-bot: I haz the power, 2014-08-11 16:44:47]

Change committed as 288728