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The webstore_api_constants is no longer being used, so removing it.

Bug: 882045
Change-Id: If0ab15c26eb70c89a9bad3d236c0fa62b71ef2fb
Reviewed-on: https://chromium-review.googlesource.com/c/1299545
Commit-Queue: Benjamin Ackerman <ackermanb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603205}