Fix an issue in fullscreen detector when context is destroyed

Fix an issue in fullscreen detector when context is destroyed

There's a race condition causing the WebMediaPlayer to be destroyed
before MediaCustomControlsFullscreenDetector dispatches the final
change. This CL fixes the issue.

BUG=698034
Review-Url: https://codereview.chromium.org/2743573003
Cr-Commit-Position: refs/heads/master@{#456160}
(cherry picked from commit ac5c34a5e762fd095bf129de24512100be09872a)

Review-Url: https://codereview.chromium.org/2741343002 .
Cr-Commit-Position: refs/branch-heads/3029@{#137}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/cca045b0ea07b27182777033f531130b80066575

[Zhiqiang Zhang (Slow), 2017-03-12 18:36:37]

Description was changed from

==========
Fix an issue in fullscreen detector when context is destroyed

There's a race condition causing the WebMediaPlayer to be destroyed
before MediaCustomControlsFullscreenDetector dispatches the final
change. This CL fixes the issue.

BUG=698034

Review-Url: https://codereview.chromium.org/2743573003
Cr-Commit-Position: refs/heads/master@{#456160}
(cherry picked from commit ac5c34a5e762fd095bf129de24512100be09872a)
==========

to

==========
Fix an issue in fullscreen detector when context is destroyed

There's a race condition causing the WebMediaPlayer to be destroyed
before MediaCustomControlsFullscreenDetector dispatches the final
change. This CL fixes the issue.

BUG=698034

Review-Url: https://codereview.chromium.org/2743573003
Cr-Commit-Position: refs/heads/master@{#456160}
(cherry picked from commit ac5c34a5e762fd095bf129de24512100be09872a)

Review-Url: https://codereview.chromium.org/2741343002 .
Cr-Commit-Position: refs/branch-heads/3029@{#137}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/cca045b0ea07b27182777033f531...
==========

[Zhiqiang Zhang (Slow), 2017-03-12 18:36:39]

Committed patchset #1 (id:1) manually as
cca045b0ea07b27182777033f531130b80066575 (tree was closed).