DLP: Change managed toasts icon

- Changed the managed icon show in managed toasts
to SystemMenuBusiness icon.
- Attached in the bug screenshots of how the previous
and the current icons look in toasts.

Bug: 1148285
Change-Id: Idbb2737d0b6dd4a13028786b5d4ae1939566b50d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532081Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Aya Elsayed <ayaelattar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827197}

ash/system/toast/toast_overlay.cc

@@ -232,7 +232,7 @@ class ToastOverlayView : public views::View {
             AshColorProvider::BaseLayerType::kTransparent80)));
     if (managed_icon_) {
       managed_icon_->SetImage(gfx::CreateVectorIcon(
-          kUnifiedMenuManagedIcon,
+          kSystemMenuBusinessIcon,
           color_provider->GetContentLayerColor(
               AshColorProvider::ContentLayerType::kIconColorPrimary)));
     }