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IDS_EXTENSION_PROMPT_RATING_ACCESSIBLE_TEXT is compliant to the ICU
message format spec (so, the unittest passes), but it's rejected
by the translation infra's ICU msg syntax checker because it has
additional constraints on the ICU syntax: A plural selector should be
at the outer most level.

Rewrite it to work with the translation infra.

Bug: 791716
Test: browser_test --gtest_filter=Extensi*.RatingsSectionA11y
Change-Id: Id88bad4554b106acebe20064fab8870e03a44843
Reviewed-on: https://chromium-review.googlesource.com/807353
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521799}