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Switch to using new stack trace collection API:
base::debug::CollectStackTrace() collects stack traces directly,
allowing us to remove cumbersome logic handling StackTrace
construction/destruction and also move the stack traces into the
SlotMetadata simplifying the crash handler logic.

Bug: 896019
Change-Id: I36f525c242c5a6d24d9ded9d1bfa7949c7cab30c
Reviewed-on: https://chromium-review.googlesource.com/c/1429624
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625826}