zijiehe 67e438ffe5 Fix http://crbug.com/741252
The root cause is when a DxgiContext is reseted, it has not been correctly
cleared from DxgiOutputDuplicator. So during next CaptureFrame() function call,
DxgiOutputDuplicator will spread the context change to a deleted instance.

BUG=741252

Review-Url: https://codereview.webrtc.org/2975103002
Cr-Commit-Position: refs/heads/master@{#18992}
2017-07-13 00:29:36 +00:00
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