Comment out lkcr/lkgr fetching from chromium/src.git's git cache

Comment out lkcr/lkgr fetching from chromium/src.git's git cache

This isn't doing anything, and is currently costing 20 seconds of idle time
per bot_update run.  Lets remove it until we convert lkcr/lkgr to tags.

BUG=261741
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=266055

[Ryan Tseng, 2014-04-24 23:38:10]

This should shave 20 seconds off bot_update.  ptal.

[Ryan Tseng, 2014-04-24 23:39:03]

Evidence:

[0:00:02] running "git fetch -v --progress origin
+refs/tags/lkgr:refs/tags/lkgr" in
"/b/build/slave/cache_dir/chromium.googlesource.com-chromium-src"
[0:00:03] fatal: Couldn't find remote ref refs/tags/lkgr
[0:00:03] Unexpected end of command stream
[0:00:03] fatal: Couldn't find remote ref refs/tags/lkgr
[0:00:03] Unexpected end of command stream
[0:00:05] fatal: Couldn't find remote ref refs/tags/lkgr
[0:00:05] Unexpected end of command stream
[0:00:07] fatal: Couldn't find remote ref refs/tags/lkgr
[0:00:07] Unexpected end of command stream
[0:00:11] running "git fetch -v --progress origin
+refs/tags/lkcr:refs/tags/lkcr" in
"/b/build/slave/cache_dir/chromium.googlesource.com-chromium-src"
[0:00:11] fatal: Couldn't find remote ref refs/tags/lkcr
[0:00:11] Unexpected end of command stream
[0:00:12] fatal: Couldn't find remote ref refs/tags/lkcr
[0:00:12] Unexpected end of command stream
[0:00:14] fatal: Couldn't find remote ref refs/tags/lkcr
[0:00:14] Unexpected end of command stream
[0:00:16] fatal: Couldn't find remote ref refs/tags/lkcr
[0:00:16] Unexpected end of command stream
[0:00:20] ________ unmanaged solution; skipping src
[0:00:20] Finished.

The 18 seconds here is work that gclient doesn't need to do right now.

[szager1, 2014-04-24 23:56:48]

lgtm

But only because the terminal spew is distracting.  I don't think 20 seconds is
much of a prize.

[Ryan Tseng, 2014-04-25 00:00:26]

The CQ bit was checked by hinoka@google.com

[commit-bot: I haz the power, 2014-04-25 00:00:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hinoka@google.com/256683002/1

[commit-bot: I haz the power, 2014-04-25 00:02:22]

Change committed as 266055