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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