DevTools: InspectorHistory actions become refcounted.

DevTools: InspectorHistory actions become refcounted.

This patch makes InspectorHistory::Action class to be refcounted. This
helps to get results of completed operations in InspectorHistory without
possibility of use-after-free (this patch fixes two of this cases).

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170054

[lushnikov, 2014-03-25 15:47:35]

Please take a look

[apavlov, 2014-03-25 16:13:53]

lgtm,

according to pfeldman

[lushnikov, 2014-03-26 07:44:20]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2014-03-26 07:44:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/lushnikov@chromium.org/208893007/1

[commit-bot: I haz the power, 2014-03-26 08:54:35]

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

[commit-bot: I haz the power, 2014-03-26 08:54:35]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[lushnikov, 2014-03-26 12:30:47]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2014-03-26 12:31:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/lushnikov@chromium.org/208893007/1

[commit-bot: I haz the power, 2014-03-26 13:19:53]

Change committed as 170054