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Rename INSECURE to INFO and DANGEROUS to NOT_SECURE_WARNING. The
eventual goal is to use the info icon to convey site information
and a grey triangle icon to indicate non-secure connections
(crbug.com/1008219). Thus, this cl renames the info icon to be more
descriptive and the danger icon to be more general.

Bug: 1008219
Change-Id: Id012ec42d4c6ec75e4f7aee4247029b89b4d704a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876129Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709054}