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Instead of using system webview's resource whitelist, now uses a
generated list of resource IDs that are actually packed into
Webview's locale paks. This fixes the missing strings issue.

Original issue:
https://codereview.chromium.org/2980773002/

TBR=agrieve@chromium.org,dpranke@chromium.org,thestig@chromium.org,sadrul@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days
ago.
BUG=724110, 742388

Review-Url: https://codereview.chromium.org/2977993002
Cr-Commit-Position: refs/heads/master@{#487176}