overscroll: Disable overscroll by default.

content/browser/web_contents/web_contents_view_aura_browsertest.cc

Index: content/browser/web_contents/web_contents_view_aura_browsertest.cc
diff --git a/content/browser/web_contents/web_contents_view_aura_browsertest.cc b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
index 2a58d8686ddee4b64d744f2117dbfe96d54641b2..7f3926123890ba1c3917e2c1e19c5b9f8fcd46db 100644
--- a/content/browser/web_contents/web_contents_view_aura_browsertest.cc
+++ b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
@@ -66,6 +66,10 @@ class WebContentsViewAuraTest : public ContentBrowserTest {
  public:
   WebContentsViewAuraTest() {}
 
+  virtual void SetUpCommandLine(CommandLine* command_line) {
+    command_line->AppendSwitch(switches::kEnableOverscrollHistoryNavigation);
+  }
+
   // Executes the javascript synchronously and makes sure the returned value is
   // freed properly.
   void ExecuteSyncJSFunction(RenderViewHost* rvh, const std::string& jscript) {