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This class is POSIX-specific rather than Android-specific. Treating it
as such will facilitate build configuration for future Android/Linux
profiler work.

Adds a StackSampler stub for iOS to avoid a dependency on
ThreadDelegatePosix since that platform doesn't have
pthread_getattr_np.

Also cleans up some out of date comments.

TBR=gab@chromium.org

Bug: 988579
Change-Id: If4df5da23f4ba9664f33a097c5387f6725b8301d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854502
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708220}