Clean up forward declarations in Source/core/editing

Clean up forward declarations in Source/core/editing

Clean up forward declarations in Source/core/editing

These forward references are not needed anymore. After
this patch, Source/core/editing has no unneeded forward
references anymore.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182363

[rwlbuis, 2014-09-19 21:56:04]

rob.buis@samsung.com changed reviewers:
+ haraken@chromium.org, yosin@google.com

[rwlbuis, 2014-09-19 21:56:05]

PTAL

[haraken, 2014-09-19 22:33:34]

LGTM

[rwlbuis, 2014-09-19 22:33:59]

The CQ bit was checked by rob.buis@samsung.com

[commit-bot: I haz the power, 2014-09-19 22:35:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584023005/1

[commit-bot: I haz the power, 2014-09-20 00:23:07]

Committed patchset #1 (id:1) as 182363