Update ConstrainedWindowViews appearance according to mock

chrome/browser/ui/gtk/browser_window_gtk.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 "chrome/browser/ui/gtk/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1143 matching lines @@
 
 WindowOpenDisposition BrowserWindowGtk::GetDispositionForPopupBounds(
     const gfx::Rect& bounds) {
   return NEW_POPUP;
 }
 
 FindBar* BrowserWindowGtk::CreateFindBar() {
   return new FindBarGtk(this);
 }
 
+int BrowserWindowGtk::GetConstrainedWindowTopY() {
+  return -1;
+}
+
 void BrowserWindowGtk::ShowAvatarBubble(WebContents* web_contents,
                                         const gfx::Rect& rect) {
   GtkWidget* widget = web_contents->GetContentNativeView();
   new AvatarMenuBubbleGtk(browser_.get(), widget,
       BubbleGtk::ARROW_LOCATION_TOP_LEFT, &rect);
 }
 
 void BrowserWindowGtk::ShowAvatarBubbleFromAvatarButton() {
   if (titlebar_->avatar_button())
     titlebar_->avatar_button()->ShowAvatarBubble();
@@ skipping 1259 matching lines @@
           wm_type == ui::WM_OPENBOX ||
           wm_type == ui::WM_XFWM4);
 }
 
 // static
 BrowserWindow* BrowserWindow::CreateBrowserWindow(Browser* browser) {
   BrowserWindowGtk* browser_window_gtk = new BrowserWindowGtk(browser);
   browser_window_gtk->Init();
   return browser_window_gtk;
 }