remove unused Debug::has_break_points_

remove unused Debug::has_break_points_

Previous debug refactoring changes removed uses of has_break_points_, but
omitted removing the field itself. This is not necessary anymore.

R=yangguo@chromium.org
BUG=

Committed: https://crrev.com/759591dae7adeee646b0c4296066eb7f3844bf39
Cr-Commit-Position: refs/heads/master@{#31016}

[Yang, 2015-09-30 01:22:08]

On 2015/09/30 01:18:51, ofrobots wrote:

lgtm

[ofrobots, 2015-09-30 05:39:33]

The CQ bit was checked by ofrobots@google.com

[commit-bot: I haz the power, 2015-09-30 05:39:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382443002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382443002/1

[commit-bot: I haz the power, 2015-09-30 06:02:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-30 06:02:42]

Patchset 1 (id:??) landed as
https://crrev.com/759591dae7adeee646b0c4296066eb7f3844bf39
Cr-Commit-Position: refs/heads/master@{#31016}