[Line Layout API] Convert SVGTextLayoutEngine and SVGTextLayoutEngineBaseline to line Layout API

[Line Layout API] Convert SVGTextLayoutEngine and SVGTextLayoutEngineBaseline to line Layout API

This CL converts references to LayoutSVGInlineText* objects and some general
LayoutObject* to the equivalent objects in the new line layout API
(LineLayoutSVGInlineText and LineLayoutItem). No functional changes.

BUG=499321
Committed: https://crrev.com/4a49a2181721b40522602efeda671aa6d1a2a832
Cr-Commit-Position: refs/heads/master@{#357170}

[pilgrim_google, 2015-10-30 14:35:11]

pilgrim@chromium.org changed reviewers:
+ eae@chromium.org, jsbell@chromium.org, leviw@chromium.org, ojan@chromium.org

[eae, 2015-10-30 18:20:16]

LGTM

[eae, 2015-10-30 18:20:20]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2015-10-30 18:21:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1411123014/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1411123014/1

[commit-bot: I haz the power, 2015-10-30 19:24:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-30 19:25:48]

Patchset 1 (id:??) landed as
https://crrev.com/4a49a2181721b40522602efeda671aa6d1a2a832
Cr-Commit-Position: refs/heads/master@{#357170}