Relocate source code position of VisiblePosition::init()

Relocate source code position of VisiblePosition::init()

This patch relocates |VisiblePosition::init()| after |canonicalPosition()| to
avoid having forward function declaration for a preparation of making
|canonicalPosition()| a template function to make |VisiblePostion| to work with
both a position in DOM tree and a position in composed tree, since
|VisiblePostion::init()| calls |canonicalPosition()|, we need to place a
template function |canonicalPosition()| before |init()|.

Because of |canonicalPosition()| is larger than |init()|, moving |init()| after
|canonicalPosition()| yields smaller diff than moving |canonicalPosition()|
before |init()|.

This patch is a follow up patch of http://crrev.com/1191193002

BUG=n/a
TEST=no behavior chagnes

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197448

[yosin_UTC9, 2015-06-19 05:38:46]

yosin@chromium.org changed reviewers:
+ tkent@chromium.org

[yosin_UTC9, 2015-06-19 05:39:30]

PTAL

Follow up patch for removing a forward declaration of static function.

[tkent, 2015-06-19 05:41:11]

lgtm

[yosin_UTC9, 2015-06-19 06:07:08]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2015-06-19 06:07:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1193823002/1

[commit-bot: I haz the power, 2015-06-19 06:48:53]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197448