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This CL renames ServiceWorkerHost's running_hosted_version to version
because it's obvious that the version kept by ServiceWorkerHost is the
running hosted version.

Bug: 931087
Change-Id: Icfa6ae852418c7e089b254b19a745756fd6d3c74
Tbr: kinuko@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2206935
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771470}