Avoid duplicate null check in ReplaceSelectionCommand::pastLastLeaf()

Avoid duplicate null check in ReplaceSelectionCommand::pastLastLeaf()

Avoid duplicate null check in ReplaceSelectionCommand::pastLastLeaf() by
calling m_lastNodeInserted->lastDescendant() directly instead of
lastLeafInserted(). This also makes it clearer by we are checking that
m_lastNodeInserted is not null as it is now explicitly use right after.
This avoid avoids dereferencing a pointer as we now get a reference
directly.

R=adamk

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168848

[Inactive, 2014-03-10 17:32:18]

Small follow-up clean up.

[adamk, 2014-03-10 18:03:46]

lgtm

[Inactive, 2014-03-10 18:12:34]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-03-10 18:13:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/189913017/1

[commit-bot: I haz the power, 2014-03-10 18:33:22]

Change committed as 168848