Remove kDisableDownloadNotification and stop compiling shelf code on

chrome/test/base/test_browser_window.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/test/base/test_browser_window.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 152 matching lines @@
     autofill::SaveCardBubbleController* controller,
     bool user_gesture) {
   return nullptr;
 }
 
 bool TestBrowserWindow::IsDownloadShelfVisible() const {
   return false;
 }
 
 DownloadShelf* TestBrowserWindow::GetDownloadShelf() {
+#if defined(OS_CHROMEOS)
+  return nullptr;
+#else
   return &download_shelf_;
+#endif
 }
 
 WindowOpenDisposition TestBrowserWindow::GetDispositionForPopupBounds(
     const gfx::Rect& bounds) {
   return NEW_POPUP;
 }
 
 FindBar* TestBrowserWindow::CreateFindBar() {
   return NULL;
 }
@@ skipping 23 matching lines @@
 }
 
 TestBrowserWindowOwner::~TestBrowserWindowOwner() {
   BrowserList::RemoveObserver(this);
 }
 
 void TestBrowserWindowOwner::OnBrowserRemoved(Browser* browser) {
   if (browser->window() == window_.get())
     delete this;
 }