Simplify namespace code in NativeStackSampler

Bug: 851163
Change-Id: I651da22403ba5597667549970b29d7d47a62f73b
Reviewed-on: https://chromium-review.googlesource.com/1105491
Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568484}
2 files changed