Color picker window should not have a minimize button.

ui/views/color_chooser/color_chooser_view.cc

Index: ui/views/color_chooser/color_chooser_view.cc
diff --git a/ui/views/color_chooser/color_chooser_view.cc b/ui/views/color_chooser/color_chooser_view.cc
index 8c283da829dab3e74e75b3692fd06d770c204d4d..8efdb2ad2f7cc5398985ec77fb9d69781b3a375b 100644
--- a/ui/views/color_chooser/color_chooser_view.cc
+++ b/ui/views/color_chooser/color_chooser_view.cc
@@ -437,6 +437,10 @@ void ColorChooserView::OnSaturationValueChosen(SkScalar saturation,
   textfield_->SetText(GetColorText(color));
 }
 
+bool ColorChooserView::CanMinimize() const {
+  return false;
+}
+
 View* ColorChooserView::GetInitiallyFocusedView() {
   return textfield_;
 }