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The shared JavaScript files (base.js, common.js, and
message.js) need to be moved to JavaScriptFeature instances in order
to correctly establish dependencies within WKContentWorlds. This CL
uses these new classes to inject the shared JavaScript.

This CL has no change in behavior.

Bug: 1042335, 1152112
Change-Id: Ie26fc65c1ddb3ee3ff6f4f626111159c243abc03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612516
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843265}