overscroll: Fix an issue where the overscroll window could get stuck.

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 b02929610bb06ca38d7be4a217241e8d55800346..fa093215d4cf1def737280fb0a8bf097c2eb9e1b 100644
--- a/content/browser/web_contents/web_contents_view_aura_browsertest.cc
+++ b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
@@ -96,6 +96,9 @@ class WebContentsViewAuraTest : public ContentBrowserTest {
     NavigationController& controller = web_contents->GetController();
     RenderViewHostImpl* view_host = static_cast<RenderViewHostImpl*>(
         web_contents->GetRenderViewHost());
+    WebContentsViewAura* view_aura = static_cast<WebContentsViewAura*>(
+        web_contents->GetView());
+    view_aura->SetupOverlayWindowForTesting();
 
     EXPECT_FALSE(controller.CanGoBack());
     EXPECT_FALSE(controller.CanGoForward());