Reland "Remove IdleNotification call in the main thread of foreground tab."

Reland "Remove IdleNotification call in the main thread of foreground tab."

V8 posts idle tasks explicitly.

BUG=490559, 531657
Committed: https://crrev.com/f94ad2460d7a0979e41460b6d93d4434c0f16db7
Cr-Commit-Position: refs/heads/master@{#353041}

[ulan, 2015-10-08 10:57:38]

ulan@chromium.org changed reviewers:
+ haraken@chromium.org

[ulan, 2015-10-08 10:57:38]

Could you ptal?

This relands http://src.chromium.org/viewvc/blink?revision=202123

The regression was fixed in another CL.

[haraken, 2015-10-08 11:13:38]

LGTM

[ulan, 2015-10-08 11:17:09]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2015-10-08 11:17:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1396793002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1396793002/1

[commit-bot: I haz the power, 2015-10-08 12:25:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-08 12:26:33]

Patchset 1 (id:??) landed as
https://crrev.com/f94ad2460d7a0979e41460b6d93d4434c0f16db7
Cr-Commit-Position: refs/heads/master@{#353041}