DevTools: clean up BUILD.gn

DevTools: clean up BUILD.gn

- removes debug switch that I deprecated in previous CL
https://crrev.com/2336943002
- makes the build applications GN rules more DRY

BUG=none

Committed: https://crrev.com/a66d94b07598badf58f0e341e57d9b53dd6955dd
Cr-Commit-Position: refs/heads/master@{#419604}

[chenwilliam, 2016-09-19 18:35:15]

chenwilliam@chromium.org changed reviewers:
+ pfeldman@chromium.org

[chenwilliam, 2016-09-19 18:35:15]

PTAL.

[pfeldman, 2016-09-19 22:52:06]

lgtm

[chenwilliam, 2016-09-19 22:54:28]

The CQ bit was checked by chenwilliam@chromium.org

[commit-bot: I haz the power, 2016-09-19 22:54:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-19 23:57:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-19 23:59:05]

Description was changed from

==========
DevTools: clean up BUILD.gn

- removes debug switch that I deprecated in previous CL
https://crrev.com/2336943002
- makes the build applications GN rules more DRY

BUG=none
==========

to

==========
DevTools: clean up BUILD.gn

- removes debug switch that I deprecated in previous CL
https://crrev.com/2336943002
- makes the build applications GN rules more DRY

BUG=none

Committed: https://crrev.com/a66d94b07598badf58f0e341e57d9b53dd6955dd
Cr-Commit-Position: refs/heads/master@{#419604}
==========

[commit-bot: I haz the power, 2016-09-19 23:59:05]

Patchset 1 (id:??) landed as
https://crrev.com/a66d94b07598badf58f0e341e57d9b53dd6955dd
Cr-Commit-Position: refs/heads/master@{#419604}