Fix an assertion failure in FrameSelection::selectAll().

Fix an assertion failure in FrameSelection::selectAll().

Don't try to make VisibleSelection for elements of which content is not
selectable.

This CL has no user-visible behavior changes because
selectionFromContentsOfNode() created a null VisibleSelection before this CL.

BUG=477839
TEST=automated

Committed: https://crrev.com/526d14e61982c269e32bb2dd9869cd9185ab3da0
Cr-Commit-Position: refs/heads/master@{#372015}

[tkent, 2016-01-28 04:22:25]

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

[tkent, 2016-01-28 04:22:26]

yosin@, would you review this please?

[yosin_UTC9, 2016-01-28 04:32:01]

The CQ bit was checked by yosin@chromium.org

[yosin_UTC9, 2016-01-28 04:32:01]

lgtm

[commit-bot: I haz the power, 2016-01-28 04:33:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1647833002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1647833002/1

[commit-bot: I haz the power, 2016-01-28 04:38:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-28 04:39:35]

Description was changed from

==========
Fix an assertion failure in FrameSelection::selectAll().

Don't try to make VisibleSelection for elements of which content is not
selectable.

This CL has no user-visible behavior changes because
selectionFromContentsOfNode() created a null VisibleSelection before this CL.

BUG=477839
TEST=automated
==========

to

==========
Fix an assertion failure in FrameSelection::selectAll().

Don't try to make VisibleSelection for elements of which content is not
selectable.

This CL has no user-visible behavior changes because
selectionFromContentsOfNode() created a null VisibleSelection before this CL.

BUG=477839
TEST=automated

Committed: https://crrev.com/526d14e61982c269e32bb2dd9869cd9185ab3da0
Cr-Commit-Position: refs/heads/master@{#372015}
==========

[commit-bot: I haz the power, 2016-01-28 04:39:35]

Patchset 1 (id:??) landed as
https://crrev.com/526d14e61982c269e32bb2dd9869cd9185ab3da0
Cr-Commit-Position: refs/heads/master@{#372015}