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This splits the webview and weblayer component strings into separate
paks, so that weblayer can include english only translations of the
necessary strings.

Bug: 1021257
Change-Id: I636586b29cdf2564cd6e7bbd5c72feeb965ce3eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912654
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714709}