Color picker window should not have a minimize button.

ui/views/window/custom_frame_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/window/custom_frame_view.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/strings/utf_string_conversions.h"
@@ skipping 581 matching lines @@
                    rb.GetImageNamed(pushed_image_id).ToImageSkia());
   AddChildView(button);
   return button;
 }
 
 ImageButton* CustomFrameView::GetImageButton(views::FrameButton frame_button) {
   ImageButton* button = NULL;
   switch (frame_button) {
     case views::FRAME_BUTTON_MINIMIZE: {
       button = minimize_button_;
+      // If we should not show the minimize button, then we return NULL as we
+      // don't want this button to become visible and to be laid out.
+      bool should_show = frame_->widget_delegate()->CanMinimize();
+      button->SetVisible(should_show);
+      if (!should_show)
+        return NULL;
+
       break;
     }
     case views::FRAME_BUTTON_MAXIMIZE: {
       bool is_restored = !frame_->IsMaximized() && !frame_->IsMinimized();
       button = is_restored ? maximize_button_ : restore_button_;
       // If we should not show the maximize/restore button, then we return
       // NULL as we don't want this button to become visible and to be laid
       // out.
       bool should_show = frame_->widget_delegate()->CanMaximize();
       button->SetVisible(should_show);
       if (!should_show)
         return NULL;
 
       break;
     }
     case views::FRAME_BUTTON_CLOSE: {
       button = close_button_;
       break;
     }
   }
   return button;
 }
 
 }  // namespace views