Use mocked scrollbar in webkit unit tests

third_party/WebKit/Source/web/LinkHighlightImplTest.cpp

Index: third_party/WebKit/Source/web/LinkHighlightImplTest.cpp
diff --git a/third_party/WebKit/Source/web/LinkHighlightImplTest.cpp b/third_party/WebKit/Source/web/LinkHighlightImplTest.cpp
index b7b138c0c8a9d6cf62a4ebbe2dffc5d3c5d3a5a5..d185265eb2a6f675d12ace58f693009712999a23 100644
--- a/third_party/WebKit/Source/web/LinkHighlightImplTest.cpp
+++ b/third_party/WebKit/Source/web/LinkHighlightImplTest.cpp
@@ -59,6 +59,8 @@ GestureEventWithHitTestResults getTargetedEvent(WebViewImpl* webViewImpl, WebGes
 
 TEST(LinkHighlightImplTest, verifyWebViewImplIntegration)
 {
+    FrameTestHelpers::UseMockScrollbarSettings mockScrollbarSettings;
+
     const std::string baseURL("http://www.test.com/");
     const std::string fileName("test_touch_link_highlight.html");
 
@@ -129,6 +131,8 @@ WebViewClient* compositingWebViewClient()
 
 TEST(LinkHighlightImplTest, resetDuringNodeRemoval)
 {
+    FrameTestHelpers::UseMockScrollbarSettings m_mockScrollbarSettings;
+
     const std::string baseURL("http://www.test.com/");
     const std::string fileName("test_touch_link_highlight.html");
 
@@ -167,6 +171,8 @@ TEST(LinkHighlightImplTest, resetDuringNodeRemoval)
 
 TEST(LinkHighlightImplTest, multipleHighlights)
 {
+    FrameTestHelpers::UseMockScrollbarSettings m_mockScrollbarSettings;
+
     const std::string baseURL("http://www.test.com/");
     const std::string fileName("test_touch_link_highlight.html");