Fix Java weak reference nullification in MediaSessionAndroid

Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
TBR=tedchoc@chromium.org

Committed: https://crrev.com/05e950493073776c3f1817cbe11df728c04ebeae
Cr-Commit-Position: refs/heads/master@{#429476}

[Zhiqiang Zhang (Slow), 2016-11-02 23:33:08]

Description was changed from

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when content::MediaSession
is destroyed.

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
==========

to

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
==========

[Zhiqiang Zhang (Slow), 2016-11-02 23:33:55]

zqzhang@chromium.org changed reviewers:
+ boliu@chromium.org

[Zhiqiang Zhang (Slow), 2016-11-02 23:33:56]

PTAL! Thanks for pointing out the issue :)

[boliu, 2016-11-02 23:39:05]

lgtm

[Zhiqiang Zhang (Slow), 2016-11-02 23:42:54]

Description was changed from

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
==========

to

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
TBR=tedchoc@chromium.org
==========

[Zhiqiang Zhang (Slow), 2016-11-02 23:43:45]

The CQ bit was checked by zqzhang@chromium.org

[commit-bot: I haz the power, 2016-11-02 23:44:42]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-03 00:33:31]

Description was changed from

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
TBR=tedchoc@chromium.org
==========

to

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
TBR=tedchoc@chromium.org
==========

[commit-bot: I haz the power, 2016-11-03 00:33:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-03 00:36:56]

Description was changed from

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
TBR=tedchoc@chromium.org
==========

to

==========
Fix Java weak reference nullification in MediaSessionAndroid

This CL fixes a Java weak reference nullification issue which happens
when a garbage collection is run between garbage collecting Java
WebContents and MediaSessionAndroid destruction. MediaSessionAndroid
should always unset the Java weak reference when receiving
MediaSessionDestroyed().

This CL also re-enables a flaky test disabled previously due to this
issue.

BUG=661444
TBR=tedchoc@chromium.org

Committed: https://crrev.com/05e950493073776c3f1817cbe11df728c04ebeae
Cr-Commit-Position: refs/heads/master@{#429476}
==========

[commit-bot: I haz the power, 2016-11-03 00:36:57]

Patchset 1 (id:??) landed as
https://crrev.com/05e950493073776c3f1817cbe11df728c04ebeae
Cr-Commit-Position: refs/heads/master@{#429476}