Clear BodyStreamBuffer::m_handle in close()/error()

Clear BodyStreamBuffer::m_handle in close()/error()

After close()/error() is called, |m_handle| is no longer used but not cleared
until lock() is called or BodyStreamBuffer is garbage collected.
This leads data transfer to continue after reader is cancelled from JavaScript.

This CL clears m_handle in close()/error() to destruct both the reader and
handle of the source of BodyStreamBuffer and to stop transfer immediately.

BUG=537286
Committed: https://crrev.com/ac0ed659d89e881943da62e2488099696fe1b676
Cr-Commit-Position: refs/heads/master@{#351555}

[hiroshige, 2015-09-30 06:44:32]

The CQ bit was checked by hiroshige@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-30 06:44:53]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1376153002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1376153002/1

[hiroshige, 2015-09-30 07:56:19]

The CQ bit was checked by hiroshige@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-30 07:56:28]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1376153002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1376153002/20001

[hiroshige, 2015-09-30 08:00:45]

hiroshige@chromium.org changed reviewers:
+ yhirano@chromium.org

[hiroshige, 2015-09-30 08:03:48]

PTAL.

[yhirano, 2015-09-30 09:29:21]

lgtm, thanks!

[hiroshige, 2015-09-30 09:33:45]

The CQ bit was unchecked by hiroshige@chromium.org

[hiroshige, 2015-09-30 09:33:51]

The CQ bit was checked by hiroshige@chromium.org

[commit-bot: I haz the power, 2015-09-30 09:34:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1376153002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1376153002/20001

[commit-bot: I haz the power, 2015-09-30 12:15:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-30 12:15:14]

Try jobs failed on following builders:
  linux_android_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_android_r...)

[hiroshige, 2015-09-30 13:30:22]

The CQ bit was checked by hiroshige@chromium.org

[commit-bot: I haz the power, 2015-09-30 13:30:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1376153002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1376153002/20001

[commit-bot: I haz the power, 2015-09-30 14:53:49]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-30 14:54:40]

Patchset 2 (id:??) landed as
https://crrev.com/ac0ed659d89e881943da62e2488099696fe1b676
Cr-Commit-Position: refs/heads/master@{#351555}