Avoid anchoring to pseudo elements when using logical ordering in a selection

Avoid anchoring to pseudo elements when using logical ordering in a selection

When we start the selection range in an element the selection is taken to include
its :before or :after pseudoelement. So likewise when we modify the selection to an 
element on a line boundary that selection should include its :before/:after 
pseduoelements.

BUG=342574
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184798

[esprehn, 2014-11-03 18:46:25]

esprehn@chromium.org changed reviewers:
+ esprehn@chromium.org

[esprehn, 2014-11-03 18:46:26]

lgtm, thanks for fixing this crash!

https://codereview.chromium.org/693283002/diff/1/LayoutTests/TestExpectations
File LayoutTests/TestExpectations (right):

https://codereview.chromium.org/693283002/diff/1/LayoutTests/TestExpectations...
LayoutTests/TestExpectations:660: # ASSERT fails in debug since editing attempts
to put a Position on a pseudo element.
Remove the comment too.

[rhogan, 2014-11-03 19:23:01]

The CQ bit was checked by robhogan@gmail.com

[commit-bot: I haz the power, 2014-11-03 19:23:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/693283002/20001

[commit-bot: I haz the power, 2014-11-03 20:24:08]

Committed patchset #2 (id:20001) as 184798