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Since Flash is now the only supported plugin, this patch removes all the
generic language in the dialog and makes it specific to Flash. This
patch also deletes some related strings that were unused.

Bug: 652030
Change-Id: Iadd4eb43305f269456c59a06132c9d9c2184c6e3
Reviewed-on: https://chromium-review.googlesource.com/685806Reviewed-by: Adrienne Porter Felt <felt@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505888}