Andrey Lushnikov 2a8801be1e
browser(firefox): fix Firefox crashes (#10904)
Review URL: aff16fc8e4

This patch fixes 2 firefox crashers:
- color scheme override code was not used, but was called
  from multiple threads, which caused a weakptr use violation (cannot
  be used from multiple threads)
- snapshot listener callback was reset asynchronously, so when
  `HeadlessWindowCapturer` was destroyed, it was still occasionally
  called (see `HeadlessWindowCapturer::~HeadlessWindowCapturer`)

With this patch, I no londer experience tracing crashes in firefox.

References #10259
2021-12-13 21:23:25 -08:00
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