commit 1657802d64c2945eae971ca90bbb33a9e48f5026
author yosin <yosin@chromium.org> Thu Jul 21 01:25:46 2016
committer Commit bot <commit-bot@chromium.org> Thu Jul 21 01:28:14 2016
tree b887be8284eb802e47d7cfada6a1e9d23574644d
parent d3c83a8af9a2c06a49b16e26f43ea7338a72e283

Make CompositeEditCommand::moveParagraph() to abort when destination becomes invisible

This patch makes |CompositeEditCommand::moveParagraph()| to abort when
destination of paragraph becomes invisible.

This patch also changes |assert_selection()| test utility to handle no BODY
element document to support attached test.

BUG=620873
TEST=LayoutTests/editing/execCommand/apply_style/justify_full_without_body_crash.html

Review-Url: https://codereview.chromium.org/2131113002
Cr-Commit-Position: refs/heads/master@{#406738}