[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

BUG=

Committed: https://crrev.com/3dc43a7550c7142c940681492e3f792dc91f0122
Cr-Commit-Position: refs/heads/master@{#35238}

[Hannes Payer (out of office), 2016-04-01 12:33:29]

hpayer@chromium.org changed reviewers:
+ mlippautz@chromium.org

[Michael Lippautz, 2016-04-01 12:45:45]

lgtm

[Hannes Payer (out of office), 2016-04-01 13:00:28]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2016-04-01 13:00:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1844293005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1844293005/1

[commit-bot: I haz the power, 2016-04-01 13:03:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-01 13:03:57]

Try jobs failed on following builders:
  v8_linux64_asan_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_asan_rel/builds/...)
  v8_linux_mipsel_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mipsel_compile_rel...)

[Hannes Payer (out of office), 2016-04-04 12:35:45]

The CQ bit was checked by hpayer@chromium.org

[Hannes Payer (out of office), 2016-04-04 12:35:46]

The patchset sent to the CQ was uploaded after l-g-t-m from
mlippautz@chromium.org
Link to the patchset: https://codereview.chromium.org/1844293005/#ps20001
(title: " ")

[commit-bot: I haz the power, 2016-04-04 12:36:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1844293005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1844293005/20001

[commit-bot: I haz the power, 2016-04-04 13:00:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-04-04 13:01:54]

Description was changed from

==========
[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

BUG=
==========

to

==========
[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

BUG=

Committed: https://crrev.com/3dc43a7550c7142c940681492e3f792dc91f0122
Cr-Commit-Position: refs/heads/master@{#35238}
==========

[commit-bot: I haz the power, 2016-04-04 13:01:56]

Patchset 2 (id:??) landed as
https://crrev.com/3dc43a7550c7142c940681492e3f792dc91f0122
Cr-Commit-Position: refs/heads/master@{#35238}