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Also put the "pdf-isolation" feature behind the same ifdef. These
features should only be available when plugins are enabled at compile
time.

Bug: 61248
Change-Id: Ia928ea89d197d2f94d80e1e67c8ac8ece13548f8
Reviewed-on: https://chromium-review.googlesource.com/c/1330846
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608046}