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Now that the SDK has all of the necessary dependencies to run
Chromium WebRunner, the install procedure is now reasonable and can be
documented.

Change-Id: I009a74d48673c3ea4126cc593db177ba23ede715
Reviewed-on: https://chromium-review.googlesource.com/1226461
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594366}