Use tighter typing in Editing: VisibleUnits

Use tighter typing in Editing: VisibleUnits

Use tighter typing in editing/ to increase code readability. This CL focuses on
VisibleUnits.

R=leviw@chromium.org, yosin@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179555

[leviw_travelin_and_unemployed, 2014-08-04 18:31:48]

Sure. LGTM.

[leviw_travelin_and_unemployed, 2014-08-04 18:31:50]

The CQ bit was checked by leviw@chromium.org

[commit-bot: I haz the power, 2014-08-04 18:32:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-04 19:43:15]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/1...)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20585)

[commit-bot: I haz the power, 2014-08-04 19:54:14]

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

[commit-bot: I haz the power, 2014-08-04 19:54:15]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20607)

[Inactive, 2014-08-04 19:58:24]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-08-04 19:59:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-04 20:42:29]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20610)

[commit-bot: I haz the power, 2014-08-04 21:19:19]

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

[commit-bot: I haz the power, 2014-08-04 21:19:19]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20626)

[Inactive, 2014-08-04 23:30:51]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-08-04 23:31:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-05 00:10:54]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20670)

[commit-bot: I haz the power, 2014-08-05 01:14:37]

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

[commit-bot: I haz the power, 2014-08-05 01:14:38]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20682)

[Inactive, 2014-08-05 01:28:33]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-08-05 01:29:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-05 01:36:01]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20708)

[commit-bot: I haz the power, 2014-08-05 02:12:50]

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

[commit-bot: I haz the power, 2014-08-05 02:12:51]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20711)

[Inactive, 2014-08-05 13:05:50]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-08-05 13:07:00]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-05 14:37:34]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20929)

[commit-bot: I haz the power, 2014-08-05 15:59:48]

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

[commit-bot: I haz the power, 2014-08-05 15:59:49]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/20967)

[Inactive, 2014-08-05 19:07:35]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-08-05 19:08:59]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-05 23:35:03]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/21135)

[commit-bot: I haz the power, 2014-08-06 00:26:16]

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

[commit-bot: I haz the power, 2014-08-06 00:26:17]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/21165)

[Inactive, 2014-08-06 01:27:13]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-08-06 01:28:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/434773003/1

[commit-bot: I haz the power, 2014-08-06 02:03:13]

Change committed as 179555