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This reverts commit 30df8d48.

Reason for revert: Broke linux-chromeos-chrome compile. See https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/6735

Original change's description:
> Refactor platform keys service token ID
> 
> This CL changes how platform keys service expects token IDs from the
> service consumers and makes it clear what to expect in special cases
> like empty/unprovided token IDs.
> 
> Before this CL, platform keys service was accepting token IDs as strings
> which is not as clear as enums especially for the cases of empty
> strings.
> 
> Bug: 1073512
> Change-Id: I4cbdfdc8f22b23ce0297314915e52804b2e495f3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270069
> Commit-Queue: Omar Morsi <omorsi@google.com>
> Reviewed-by: Pavol Marko <pmarko@chromium.org>
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Reviewed-by: Michael Ershov <miersh@google.com>
> Cr-Commit-Position: refs/heads/master@{#784448}

TBR=emaxx@chromium.org,pmarko@chromium.org,miersh@google.com,omorsi@google.com

Change-Id: Ib163fce34664943e586b43a8c4a9f79eb59be260
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1073512
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277117Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784481}