dark_mode: Remove kEnableBackgroundBlur check for power menu and toast.

Background blur has been set for power menu and system toast by default,
remove flag kEnableBackgroundBlur checking for them.

Bug: 1130618
Change-Id: Ibd15ebd10369f605bac4ff123496a3777171ecbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422351Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809121}

ash/system/power/power_button_menu_view.cc

@@ -8,7 +8,6 @@
 
 #include "ash/display/screen_orientation_controller.h"
 #include "ash/login/login_screen_controller.h"
-#include "ash/public/cpp/ash_features.h"
 #include "ash/public/cpp/new_window_delegate.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "ash/session/session_controller_impl.h"
@@ -54,9 +53,7 @@ PowerButtonMenuView::PowerButtonMenuView(
   SetPaintToLayer();
   SetBackground(
       views::CreateSolidBackground(AshColorProvider::Get()->GetBaseLayerColor(
-          features::IsBackgroundBlurEnabled()
-              ? AshColorProvider::BaseLayerType::kTransparent80
-              : AshColorProvider::BaseLayerType::kTransparent90)));
+          AshColorProvider::BaseLayerType::kTransparent80)));
   layer()->SetFillsBoundsOpaquely(false);
   layer()->SetRoundedCornerRadius(kMenuViewRoundRectRadiusDp);
   layer()->SetBackgroundBlur(

ash/system/toast/toast_overlay.cc

@@ -5,7 +5,6 @@
 #include "ash/system/toast/toast_overlay.h"
 
 #include "ash/keyboard/ui/keyboard_ui_controller.h"
-#include "ash/public/cpp/ash_features.h"
 #include "ash/public/cpp/ash_typography.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
@@ -160,9 +159,7 @@ class ToastOverlayView : public views::View, public views::ButtonListener {
       : overlay_(overlay) {
     SetPaintToLayer();
     background_color_ = AshColorProvider::Get()->GetBaseLayerColor(
-        features::IsBackgroundBlurEnabled()
-            ? AshColorProvider::BaseLayerType::kTransparent80
-            : AshColorProvider::BaseLayerType::kTransparent90);
+        AshColorProvider::BaseLayerType::kTransparent80);
     SetBackground(views::CreateSolidBackground(background_color_));
     layer()->SetFillsBoundsOpaquely(false);
     layer()->SetRoundedCornerRadius(gfx::RoundedCornersF(kToastCornerRounding));