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This is a reland of a9df5b29

Differences from original cl:
- PageInfoUI::SecurityDescription GetSecurityDetails() changed to
PageInfoUI::SecurityDescriptionType GetSecurityDescriptionType()
- Initialize security_description_type_ in the header file
- In safety_tip_page_info_bubble_view_browsertest, static cast to a
regular page info bubble instead of safety tip bubble for
CheckPageInfoDoesNotShowSafetyTipInfo

Original change's description:
> Handle Safety Tip learn more link in page info
>
> Bug: 1007497
> Change-Id: I4498d39cabf4736a697294ad027082a53894a623
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857166
> Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
> Reviewed-by: Emily Stark <estark@chromium.org>
> Commit-Queue: Livvie Lin <livvielin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#706076}

Bug: 1007497
Change-Id: I8dcebe8a7ab974e72eea24280578f8f6830031b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867478Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708046}