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This CL moves ReplacePlaceholders() to //content in preparation for using
ReplacePlaceholders() in manifest_parser.cc

Change-Id: Ia4fb6533bcc6f914e3e5499577edb2212583af8a
Reviewed-on: https://chromium-review.googlesource.com/924550
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543440}