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The dark mode page policy is used for deciding whether to apply dark
mode filter to the given LayoutView or not based on values kFilterAll
(always process) or kFilterByBackground (process based on background
color.) The current code has kFilterByBackground as a default value.
But processing based on background of root layout object can lead
issues like not applying dark mode to children having light or
transparent backgrounds.

This patch removes page policy concept and now every layout object
gets classified for applying dark mode. All the sites for which page
policy kFilterByBackground was added, work properly after removing
the page policy concept.

This now helps pages from e.g. theverge.com render correctly in dark
mode. In these pages, children of dark backgrounds get dark mode
applied correctly and look dark. Previously they were getting rendered
as if dark mode was not applied.

Bug: 1081383
Change-Id: I1e6a941bad22689569f2aec76d5beb88daced9de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2323441Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Anna Malova <amalova@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#800573}