Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h
This CL removes #include to sequenced_worker_pool.h in sequence_checker.h
by hiding its members into a nested class, and adds #include and forward
decls to other files as needed.
Note that the non trivial diffs are in sequence_checker_impl.{h,cc} only.
The header dependency from sequence_checker.h to sequenced_worker_pool.h
prevents other headers to use sequence_checker.h due to a dependency
cycle.
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Review-Url: https://codereview.chromium.org/2690533002
Cr-Original-Commit-Position: refs/heads/master@{#450321}
Committed: https://chromium.googlesource.com/chromium/src/+/d502a3f2fa0b673a5082c1d601298bd114a9d237
Review-Url: https://codereview.chromium.org/2690533002
Cr-Commit-Position: refs/heads/master@{#450384}
198 files changed
