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We have had IPC headers where it was up to the user
to carefully only include them once. Jumbo builds where
cc files are compiled together are not that careful so they
need include guards.

This is a followup to equivalent work done in chrome and content.

Bug: 746953
Change-Id: I3dc4067e2c4e23ee41be0def78a34bf4f7cd4b96
Reviewed-on: https://chromium-review.googlesource.com/741597Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#512844}