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This CL introduces a Value::FindStringKey implementation that returns a mutable
string which can be modified inline. This reduces the number of temporary
copies needed for the LogBuffer.

Bug: 928595
Change-Id: Ic09b0bd029805b983a888b691420a9d3b32f4ee3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724516
Commit-Queue: Dominic Battré <battre@chromium.org>
Auto-Submit: Dominic Battré <battre@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682580}