chromecast/component: Convert legacy atomics -> std::atomic<> |DependencyCount::dep_count_| contains an enable/disable bit and a counter of dependencies, tracked atomically together. Convert from legacy (base::subtle) atomics to std::atomic, as we are moving away from legacy atomics. DependencyCount::Disable and DependencyCount::Enable used CompareAndSwap loops to set or clear the enabled bit; switch to std::atomic<>'s fetch_and and fetch_or, which express the state change more clearly. Bug: 40175832 Change-Id: Iad62fd877ebf6e42b9b2f6fed1594cf407dae313 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6044458 Commit-Queue: Venkatesh Srinivas <venkateshs@chromium.org> Reviewed-by: Benoit Lize <lizeb@chromium.org> Reviewed-by: Simeon Anfinrud <sanfin@chromium.org> Cr-Commit-Position: refs/heads/main@{#1466660}
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