Add test for RemoveEntryAtIndex in the pending case.

Add test for RemoveEntryAtIndex in the pending case.

This documents some possibly unexpected behavior, where the pending entry
is cleared if it exists.

BUG=428380
TEST=No behavior change.

Committed: https://crrev.com/750ade3fa8cad705e9f522269fbc2fbb12ec184e
Cr-Commit-Position: refs/heads/master@{#301989}

[Charlie Reis, 2014-10-29 18:51:03]

creis@chromium.org changed reviewers:
+ nasko@chromium.org

[Charlie Reis, 2014-10-29 18:51:04]

Just a bit of clarification, since I was surprised it wasn't buggy in this case.

[nasko, 2014-10-29 21:26:44]

LGTM

[Charlie Reis, 2014-10-29 21:29:26]

The CQ bit was checked by creis@chromium.org

[commit-bot: I haz the power, 2014-10-29 21:33:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/684173004/1

[commit-bot: I haz the power, 2014-10-30 00:20:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-30 00:20:56]

Patchset 1 (id:??) landed as
https://crrev.com/750ade3fa8cad705e9f522269fbc2fbb12ec184e
Cr-Commit-Position: refs/heads/master@{#301989}