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This change modifies base::MakeFixedFlatMap to only compare keys. This
fixes a bug where repeated keys wouldn't be detected if their values
differed. Furthermore, this also now supports values that are not
comparable.

Bug: 682254
Change-Id: I598406dee0fe47a4601a122369bc3d88de520abc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549622
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830169}