Fix P2PSocketHostUdp to handle dropped packets properly.

Fix P2PSocketHostUdp to handle dropped packets properly.

P2PSocketHostUdp may drop outgoing packets to throttle
unauthenticated outgoing STUN requests. Previously it wasn't sending
OnSendComplete message for these packets, which causes crash in the
renderer.

Also fixed another potential crashed in the same class.

BUG=630984
Review-Url: https://codereview.chromium.org/2300983003
Cr-Commit-Position: refs/heads/master@{#416316}
(cherry picked from commit 8da820dbc74943aefc6607b10eb2804547b57926)

Committed: https://chromium.googlesource.com/chromium/src/+/e245af07b7c278917d15ef66bba9840732a3eb11

[Sergey Ulanov, 2016-09-07 22:22:40]

Description was changed from

==========
Fix P2PSocketHostUdp to handle dropped packets properly.

P2PSocketHostUdp may drop outgoing packets to throttle
unauthenticated outgoing STUN requests. Previously it wasn't sending
OnSendComplete message for these packets, which causes crash in the
renderer.

Also fixed another potential crashed in the same class.

BUG=630984

Review-Url: https://codereview.chromium.org/2300983003
Cr-Commit-Position: refs/heads/master@{#416316}
(cherry picked from commit 8da820dbc74943aefc6607b10eb2804547b57926)
==========

to

==========
Fix P2PSocketHostUdp to handle dropped packets properly.

P2PSocketHostUdp may drop outgoing packets to throttle
unauthenticated outgoing STUN requests. Previously it wasn't sending
OnSendComplete message for these packets, which causes crash in the
renderer.

Also fixed another potential crashed in the same class.

BUG=630984

Review-Url: https://codereview.chromium.org/2300983003
Cr-Commit-Position: refs/heads/master@{#416316}
(cherry picked from commit 8da820dbc74943aefc6607b10eb2804547b57926)

Committed:
https://chromium.googlesource.com/chromium/src/+/e245af07b7c278917d15ef66bba9...
==========

[Sergey Ulanov, 2016-09-07 22:22:41]

Committed patchset #1 (id:1) manually as
e245af07b7c278917d15ef66bba9840732a3eb11.