Apply MD style to Linux avatar buttons.

chrome/browser/ui/views/profiles/profile_chooser_view.cc

Index: chrome/browser/ui/views/profiles/profile_chooser_view.cc
diff --git a/chrome/browser/ui/views/profiles/profile_chooser_view.cc b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
index 7140f713e67db214b6137d73cb584d0413ef11e8..69700e5b90fbe35b8050342eb47c64c55b0367c1 100644
--- a/chrome/browser/ui/views/profiles/profile_chooser_view.cc
+++ b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
@@ -530,6 +530,11 @@ bool ProfileChooserView::IsShowing() {
 }
 
 // static
+views::Widget* ProfileChooserView::GetCurrentBubbleWidget() {
+  return profile_bubble_ ? profile_bubble_->GetWidget() : nullptr;
+}
+
+// static
 void ProfileChooserView::Hide() {
   if (IsShowing())
     profile_bubble_->GetWidget()->Close();