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The embedded change updates prefetch fake page classification from NTP to
INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS to allow the request to be
correctly categorized by ZeroSuggestProvider in cases where
ZeroSuggestVariant:6 parameter (for INSTANT_NTP...) includes RemoteNoUrl
source, whereas ZeroSuggestVariant:1 parameter (for NTP) doesn't.

Bug: 1004932, 1004925
Change-Id: Ia797b490b90f1b596b1e175c91d37c975b0d45e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1861099
Commit-Queue: Ender <ender@google.com>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706197}