Remove obsolete functionality from the MacroAssemblers.

Remove obsolete functionality from the MacroAssemblers.

This is uncontroversial the dead code removal part of
https://codereview.chromium.org/1307943013, which was
previously landed, but got reverted because of DOM
breakage that requires more investigation.

TBR=jkummerow@chromium.org

Committed: https://crrev.com/64e3bad3677d01d70ddcedd541619216b973e90d
Cr-Commit-Position: refs/heads/master@{#30577}

[Benedikt Meurer, 2015-09-03 18:49:28]

Hey Jakob,

Landing this independently of the ClassOf change. TBR'ed as you already liked
the change :-)

Benedikt

[Benedikt Meurer, 2015-09-03 18:49:30]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-09-03 18:49:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1322843005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1322843005/1

[commit-bot: I haz the power, 2015-09-03 18:53:55]

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

[commit-bot: I haz the power, 2015-09-03 18:53:55]

Try jobs failed on following builders:
  v8_linux_arm64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel/builds/9333)

[Benedikt Meurer, 2015-09-03 19:47:10]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-09-03 19:47:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1322843005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1322843005/20001

[commit-bot: I haz the power, 2015-09-03 20:11:24]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-03 20:11:40]

Patchset 2 (id:??) landed as
https://crrev.com/64e3bad3677d01d70ddcedd541619216b973e90d
Cr-Commit-Position: refs/heads/master@{#30577}

[Jakob Kummerow, 2015-09-04 08:18:20]

lgtm