Fix NavigationScheduler to correctly delay tasks

Fix NavigationScheduler to correctly delay tasks

This fixes a bug introduced in https://codereview.chromium.org/1305933007
which replaced a call to startOneShot that takes seconds with a call to
postDelayedTask that takes milliseconds

BUG=497761, 510398, 528666
R=alexclarke@chromium.org
TBR=haraken@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201877

[alexclarke, 2015-09-07 14:55:49]

alexclarke@google.com changed reviewers:
+ alexclarke@google.com

[alexclarke, 2015-09-07 14:55:49]

lgtm

[jochen (gone - plz use gerrit), 2015-09-07 14:56:06]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-09-07 14:56:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304383004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304383004/1

[commit-bot: I haz the power, 2015-09-07 14:56:19]

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

[commit-bot: I haz the power, 2015-09-07 14:56:20]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[jochen (gone - plz use gerrit), 2015-09-07 15:12:35]

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

[jochen (gone - plz use gerrit), 2015-09-07 15:12:38]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-09-07 15:12:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304383004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304383004/1

[commit-bot: I haz the power, 2015-09-07 15:49:23]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201877