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Callers of GetPrerenderMode() don't have to know PrerenderMode. They
just want to know if the render frame is used for prerendering
(NoStatePrefetch). Therefore, this CL replaces GetPrerenderMode() calls
with PrerenderHelper::IsPrerendering() for code simplification.

Bug: 755921
Change-Id: Ibaf7ab7a2b1759a8f18d3a6488444f9edd832de1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596285Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842494}