Color picker window should not have a minimize button.

ui/views/color_chooser/color_chooser_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/color_chooser/color_chooser_view.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 419 matching lines @@
                                                SkScalar value) {
   hsv_[1] = saturation;
   hsv_[2] = value;
   SkColor color = SkHSVToColor(255, hsv_);
   if (listener_)
     listener_->OnColorChosen(color);
   selected_color_patch_->SetColor(color);
   textfield_->SetText(GetColorText(color));
 }
 
+bool ColorChooserView::CanMinimize() const {
+  return false;
+}
+
 View* ColorChooserView::GetInitiallyFocusedView() {
   return textfield_;
 }
 
 ui::ModalType ColorChooserView::GetModalType() const {
   return ui::MODAL_TYPE_WINDOW;
 }
 
 void ColorChooserView::WindowClosing() {
   if (listener_)
@@ skipping 22 matching lines @@
                                       const ui::KeyEvent& key_event) {
   if (key_event.key_code() != ui::VKEY_RETURN &&
       key_event.key_code() != ui::VKEY_ESCAPE)
     return false;
 
   GetWidget()->Close();
   return true;
 }
 
 }  // namespace views