Message View hardcoded color removal

Removed the hardcoded color values of MessageView,
focus_view sets the color appropriately already

Bug: 1056948
Change-Id: I9ed0caf6fed54dd5b0da18925d0a21d978523e9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138232
Commit-Queue: Matthew Porter <matt.porter@microsoft.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758252}

ui/message_center/views/message_view.cc

@@ -82,9 +82,6 @@ MessageView::MessageView(const Notification& notification)
   views::HighlightPathGenerator::Install(
       this, std::make_unique<HighlightPathGenerator>());
 
-  // TODO(amehfooz): Remove explicit color setting after native theme changes.
-  focus_ring_->SetColor(gfx::kGoogleBlue500);
-
   // Paint to a dedicated layer to make the layer non-opaque.
   SetPaintToLayer();
   layer()->SetFillsBoundsOpaquely(false);