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For few url schemes, the light color scheme is forced as they don't
have dark mode theme yet. This was done by calling
UpdatePreferredColorSchemesBasedOnURLIfNeeded(). This function gets
called from OverrideWebkitPrefs() and
OverrideWebPreferencesAfterNavigation(). The prior function sets the
prefs preferred color scheme based on IsNightModeEnabled() for Android
or native theme scheme for other platforms, but the later function
does not set it. This patch now sets preferred color scheme for all
platforms at one place in UpdatePreferredColorScheme().

As --force-dark-mode switch works only for preferred color scheme,
until dark scheme is detected in page, default background is white
which causes flicker once dark content is rendered. However this is
a separate issue.

Bug: 1137213
Change-Id: I5567149a5644a6d3d30ceabd65fb1f25e1971ad4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494296Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#822741}