Revert of "Revert 'QUIC - check for null stream_ before calling stream_'s IsDoneReading'"

Revert of "Revert 'QUIC - check for null stream_ before calling stream_'s IsDoneReading'"

Reason for revert:
Reverting this change and adding the check for nullptr to fix the crash.

Original issue's description:
>Revert "QUIC - check for null stream_ before calling stream_'s IsDoneReading"
>
>This reverts commit 98f200dee65e6d75bd75f3884255b1a920db5e47.
>
>BUG=585591
>TBR=rch@chromium.org,asvitkine@chromium.org
>
>Committed: https://crrev.com/4937af0e28fb73a4e6c8bb088cf1be8575ca761d
>Cr-Commit-Position: refs/heads/master@{#375789}}

BUG=585591
TBR=rch@chromium.org,asvitkine@chromium.org

Committed: https://crrev.com/6dd65c042d8100cd5804c96ea0081a408fcb5d5d
Cr-Commit-Position: refs/heads/master@{#379424}

[ramant (doing other things), 2016-03-04 23:54:11]

The CQ bit was checked by rtenneti@chromium.org

[commit-bot: I haz the power, 2016-03-04 23:54:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1769713002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1769713002/1

[commit-bot: I haz the power, 2016-03-05 01:17:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-05 01:18:45]

Description was changed from

==========
Revert of "Revert 'QUIC - check for null stream_ before calling stream_'s
IsDoneReading'"

Reason for revert:
Reverting this change and adding the check for nullptr to fix the crash.

Original issue's description:
>Revert "QUIC - check for null stream_ before calling stream_'s IsDoneReading"
>
>This reverts commit 98f200dee65e6d75bd75f3884255b1a920db5e47.
>
>BUG=585591
>TBR=rch@chromium.org,asvitkine@chromium.org
>
>Committed: https://crrev.com/4937af0e28fb73a4e6c8bb088cf1be8575ca761d
>Cr-Commit-Position: refs/heads/master@{#375789}}

BUG=585591
TBR=rch@chromium.org,asvitkine@chromium.org
==========

to

==========
Revert of "Revert 'QUIC - check for null stream_ before calling stream_'s
IsDoneReading'"

Reason for revert:
Reverting this change and adding the check for nullptr to fix the crash.

Original issue's description:
>Revert "QUIC - check for null stream_ before calling stream_'s IsDoneReading"
>
>This reverts commit 98f200dee65e6d75bd75f3884255b1a920db5e47.
>
>BUG=585591
>TBR=rch@chromium.org,asvitkine@chromium.org
>
>Committed: https://crrev.com/4937af0e28fb73a4e6c8bb088cf1be8575ca761d
>Cr-Commit-Position: refs/heads/master@{#375789}}

BUG=585591
TBR=rch@chromium.org,asvitkine@chromium.org

Committed: https://crrev.com/6dd65c042d8100cd5804c96ea0081a408fcb5d5d
Cr-Commit-Position: refs/heads/master@{#379424}
==========

[commit-bot: I haz the power, 2016-03-05 01:18:45]

Patchset 1 (id:??) landed as
https://crrev.com/6dd65c042d8100cd5804c96ea0081a408fcb5d5d
Cr-Commit-Position: refs/heads/master@{#379424}