overscroll: Enable overscroll navigation by default.

content/browser/web_contents/navigation_controller_impl_unittest.cc

Index: content/browser/web_contents/navigation_controller_impl_unittest.cc
diff --git a/content/browser/web_contents/navigation_controller_impl_unittest.cc b/content/browser/web_contents/navigation_controller_impl_unittest.cc
index 12c90f991ca1a120a0b438a7bb45b476ab54cc0c..7096344078c6b304fbd21ba701531fac3cb3af2f 100644
--- a/content/browser/web_contents/navigation_controller_impl_unittest.cc
+++ b/content/browser/web_contents/navigation_controller_impl_unittest.cc
@@ -3039,14 +3039,20 @@ TEST_F(NavigationControllerTest, MAYBE_PurgeScreenshot) {
     const GURL url(base::StringPrintf("http://foo%d/", i));
     NavigateAndCommit(url);
     EXPECT_EQ(i, controller.GetCurrentEntryIndex());
+  }
 
+  for (int i = 0; i < controller.GetEntryCount(); ++i) {
     entry = NavigationEntryImpl::FromNavigationEntry(
-        controller.GetActiveEntry());
+        controller.GetEntryAtIndex(i));
     controller.OnScreenshotTaken(entry->GetUniqueID(), &bitmap, true);
     EXPECT_TRUE(entry->screenshot());
   }
+
   NavigateAndCommit(GURL("https://foo/"));
   EXPECT_EQ(13, controller.GetEntryCount());
+  entry = NavigationEntryImpl::FromNavigationEntry(
+      controller.GetEntryAtIndex(11));
+  controller.OnScreenshotTaken(entry->GetUniqueID(), &bitmap, true);
 
   for (int i = 0; i < 2; ++i) {
     entry = NavigationEntryImpl::FromNavigationEntry(