[debugger] simplify stepping logic.

[debugger] simplify stepping logic.

Now that we do not support arbitrary step count anymore, we can
make this a lot easier.

R=jkummerow@chromium.org

Committed: https://crrev.com/67bd94508c0792171ae60d332c9cb2213e6a72fb
Cr-Commit-Position: refs/heads/master@{#32966}

[Jakob Kummerow, 2015-12-18 09:07:59]

lgtm

[Yang, 2015-12-18 10:09:08]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-12-18 10:09:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1539483002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1539483002/1

[commit-bot: I haz the power, 2015-12-18 10:33:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-18 10:34:40]

Description was changed from

==========
[debugger] simplify stepping logic.

Now that we do not support arbitrary step count anymore, we can
make this a lot easier.

R=jkummerow@chromium.org
==========

to

==========
[debugger] simplify stepping logic.

Now that we do not support arbitrary step count anymore, we can
make this a lot easier.

R=jkummerow@chromium.org

Committed: https://crrev.com/67bd94508c0792171ae60d332c9cb2213e6a72fb
Cr-Commit-Position: refs/heads/master@{#32966}
==========

[commit-bot: I haz the power, 2015-12-18 10:34:41]

Patchset 1 (id:??) landed as
https://crrev.com/67bd94508c0792171ae60d332c9cb2213e6a72fb
Cr-Commit-Position: refs/heads/master@{#32966}