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WebContents::GetURL() wasn't the right place to query a URL
from when checking whether to override the webkit pref sent
to the RenderViewHost when creating a renderer.

Instead, use rvh->GetSiteInstance()->GetSiteUrl(), which is
correct at the time we need to query.

The reason for this code is to ensure that:

  @media (prefers-color-scheme: dark) {
    /* bunch of dark mode styles go here */
  }

Does not apply as we have code shared across different
platforms (i.e. Linux, Windows, Mac, ChromeOS, etc.).
Only Mac & Windows currently support dark mode (and hence,
are the only platforms in which all the web UI has been
audited and/or updated). So in order to change shared code
that also runs on Linux/CrOS, we put both light/dark style
into the CSS, but disallow the dark styles from running
on non-dark-mode-enabled-platforms (Linux, CrOS).

Bug: 1007892
Fixed: 1007892
Change-Id: I1076e48eaa160a23213e6873f1d857cf54935f42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825936Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702693}