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Now, CrashRecoveryManager is a pure virtual base class with a
CrashRecoveryManagerImpl implementation and a FakeCrashRecoveryManager
test double.

This will be used in a follow-up CL to improve the robustness of the
initialization flow.

Bug: 761532, 672263
Change-Id: I104a24e8c580bf7e5b767b7ab0af1aa7cd8f3f3d
Reviewed-on: https://chromium-review.googlesource.com/727184
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510201}