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These functions are declared in prerender_util.h, but not defined.

- ReportPrerenderExternalURL()
- ReportUnsupportedPrerenderScheme()

According to the Git history, the definitions were removed by this CL:
https://crrev.com/c/c2157903

Bug: 755921
Change-Id: Id070c760d5769be2f97b36213e4fd9360a01fd94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465355
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Auto-Submit: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816309}