Made top controls work with virtual viewport pinch-to-zoom. (Blink)

Source/web/tests/ViewportTest.cpp

Index: Source/web/tests/ViewportTest.cpp
diff --git a/Source/web/tests/ViewportTest.cpp b/Source/web/tests/ViewportTest.cpp
index 3800cf96e5bfc4a70fba53556d7a116b006b8778..c7ff109f808133885bceafc13fdeb5c3da1db235 100644
--- a/Source/web/tests/ViewportTest.cpp
+++ b/Source/web/tests/ViewportTest.cpp
@@ -58,6 +58,7 @@
 namespace {
 
 using blink::FrameTestHelpers::runPendingTasks;
+using blink::FrameTestHelpers::UseMockScrollbarSettings;
 using namespace blink;
 
 class ViewportTest : public testing::Test {
@@ -93,22 +94,6 @@ protected:
     std::string m_chromeURL;
 };
 
-class UseMockScrollbarSettings {
-public:
-    UseMockScrollbarSettings()
-    {
-        Settings::setMockScrollbarsEnabled(true);
-        RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(true);
-        EXPECT_TRUE(ScrollbarTheme::theme()->usesOverlayScrollbars());
-    }
-
-    ~UseMockScrollbarSettings()
-    {
-        Settings::setMockScrollbarsEnabled(false);
-        RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(false);
-    }
-};
-
 static void setViewportSettings(WebSettings* settings)
 {
     settings->setViewportEnabled(true);