Move TextAutosizer::Cluster::Cluster() implementation to .cpp.

Move TextAutosizer::Cluster::Cluster() implementation to .cpp.

This way we won't have to include LayoutObject.h in the header.

Also need an explicit ~TextAutoSizer() in the .cpp file now, because
ComputedStyle is only forward-declared in the header file, and TextAutoSizer
has a ComputedStyle RefPtr Vector. The need for this was presumably introduced
by https://codereview.chromium.org/1999343002

BUG=614015
Committed: https://crrev.com/ae057e0a986c713b8d3b619d1e0f4be61a3f963c
Cr-Commit-Position: refs/heads/master@{#395773}

[mstensho (USE GERRIT), 2016-05-24 22:23:13]

mstensho@opera.com changed reviewers:
+ eae@chromium.org, szager@chromium.org, wkorman@chromium.org

[eae, 2016-05-24 22:28:23]

LGTM

[eae, 2016-05-24 23:21:11]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2016-05-24 23:22:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2004313005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2004313005/1

[commit-bot: I haz the power, 2016-05-25 01:50:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-25 01:52:45]

Description was changed from

==========
Move TextAutosizer::Cluster::Cluster() implementation to .cpp.

This way we won't have to include LayoutObject.h in the header.

Also need an explicit ~TextAutoSizer() in the .cpp file now, because
ComputedStyle is only forward-declared in the header file, and TextAutoSizer
has a ComputedStyle RefPtr Vector. The need for this was presumably introduced
by https://codereview.chromium.org/1999343002

BUG=614015
==========

to

==========
Move TextAutosizer::Cluster::Cluster() implementation to .cpp.

This way we won't have to include LayoutObject.h in the header.

Also need an explicit ~TextAutoSizer() in the .cpp file now, because
ComputedStyle is only forward-declared in the header file, and TextAutoSizer
has a ComputedStyle RefPtr Vector. The need for this was presumably introduced
by https://codereview.chromium.org/1999343002

BUG=614015

Committed: https://crrev.com/ae057e0a986c713b8d3b619d1e0f4be61a3f963c
Cr-Commit-Position: refs/heads/master@{#395773}
==========

[commit-bot: I haz the power, 2016-05-25 01:52:46]

Patchset 1 (id:??) landed as
https://crrev.com/ae057e0a986c713b8d3b619d1e0f4be61a3f963c
Cr-Commit-Position: refs/heads/master@{#395773}