Use mocked scrollbar in webkit unit tests

third_party/WebKit/Source/web/ExternalPopupMenuTest.cpp

 // Copyright (c) 2014 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 "config.h"
 #include "web/ExternalPopupMenu.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/frame/FrameHost.h"
@@ skipping 112 matching lines @@
 
     WebViewImpl* webView() const { return m_helper.webViewImpl(); }
     const ExternalPopupMenuWebFrameClient& client() const { return m_webFrameClient; }
     WebLocalFrameImpl* mainFrame() const { return m_helper.webViewImpl()->mainFrameImpl(); }
 
 private:
     std::string m_baseURL;
     FrameTestHelpers::TestWebViewClient m_webViewClient;
     ExternalPopupMenuWebFrameClient m_webFrameClient;
     FrameTestHelpers::WebViewHelper m_helper;
+    FrameTestHelpers::UseMockScrollbarSettings m_mockScrollbarSettings;
 };
 
 TEST_F(ExternalPopupMenuTest, PopupAccountsForVisualViewportOffset)
 {
     registerMockedURLLoad("select_mid_screen.html");
     loadFrame("select_mid_screen.html");
 
     webView()->resize(WebSize(100, 100));
     webView()->layout();
 
@@ skipping 68 matching lines @@
     ASSERT_TRUE(select->popupIsVisible());
 
     WebExternalPopupMenuClient* client = static_cast<ExternalPopupMenu*>(select->popup());
     WebVector<int> indices;
     client->didAcceptIndices(indices);
     EXPECT_FALSE(select->popupIsVisible());
     EXPECT_EQ(-1, select->selectedIndex());
 }
 
 } // namespace blink