Color picker window should not have a minimize button.

ui/views/widget/widget_delegate.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_WIDGET_DELEGATE_H_
 #define UI_VIEWS_WIDGET_WIDGET_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 40 matching lines @@
 
   virtual BubbleDelegateView* AsBubbleDelegate();
   virtual DialogDelegate* AsDialogDelegate();
 
   // Returns true if the window can ever be resized.
   virtual bool CanResize() const;
 
   // Returns true if the window can ever be maximized.
   virtual bool CanMaximize() const;
 
+  // Returns true if the window can ever be minimized.
+  virtual bool CanMinimize() const;
+
   // Returns true if the window can be activated.
   virtual bool CanActivate() const;
 
   // Returns the modal type that applies to the widget. Default is
   // ui::MODAL_TYPE_NONE (not modal).
   virtual ui::ModalType GetModalType() const;
 
   virtual ui::AXRole GetAccessibleWindowRole() const;
 
   // Returns the title to be read with screen readers.
@@ skipping 134 matching lines @@
   virtual Widget* GetWidget() OVERRIDE;
   virtual const Widget* GetWidget() const OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WidgetDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_DELEGATE_H_