Hide the incognito icon in the window frame for Refresh.

Incognito state is indicated by the avatar button in the toolbar.

BUG=822070
TEST=none

Change-Id: Ib87a4f8dbc6e89694277e40fa0f4143ad8e25496
Reviewed-on: https://chromium-review.googlesource.com/1029255Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553880}

chrome/browser/ui/views/frame/browser_non_client_frame_view.cc

@@ -422,6 +422,11 @@ void BrowserNonClientFrameView::UpdateTaskbarDecoration() {
 }
 
 bool BrowserNonClientFrameView::ShouldShowProfileIndicatorIcon() const {
+  // In Material Refresh, we use a toolbar button for all
+  // profile/incognito-related purposes.
+  if (MD::GetMode() == MD::MATERIAL_REFRESH)
+    return false;
+
   Browser* browser = browser_view()->browser();
   Profile* profile = browser->profile();
   const bool is_incognito =