Enable smooth scrolling on mac

content/renderer/render_view_browsertest_mac.mm

Index: content/renderer/render_view_browsertest_mac.mm
diff --git a/content/renderer/render_view_browsertest_mac.mm b/content/renderer/render_view_browsertest_mac.mm
index ca96f00373cd942642ba80a16c6663878df3ae2c..b2d3c36cccff76744347ccd0bda1e76e01204cbf 100644
--- a/content/renderer/render_view_browsertest_mac.mm
+++ b/content/renderer/render_view_browsertest_mac.mm
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/mac/scoped_smooth_scrolling_disabler_mac.h"
 #include "base/string_util.h"
 #include "base/string16.h"
 #include "chrome/test/base/render_view_test.h"
@@ -80,6 +81,8 @@ TEST_F(RenderViewTest, MacTestCmdUp) {
   );
   #undef HTML
 
+  base::ScopedSmoothScrollingDisabler disable_smooth_scrolling;
+
   const int kMaxOutputCharacters = 1024;
   string16 output;
   char htmlBuffer[2048];