Revert of Implement NativeViewHostAura::InstallClip.

ui/views/controls/native/native_view_host_unittest.cc

Index: ui/views/controls/native/native_view_host_unittest.cc
diff --git a/ui/views/controls/native/native_view_host_unittest.cc b/ui/views/controls/native/native_view_host_unittest.cc
index 2540732ff937b80643a23819364de9c5caf4df3c..247782437a5022d0d45cc68ee4277789ca2b69b1 100644
--- a/ui/views/controls/native/native_view_host_unittest.cc
+++ b/ui/views/controls/native/native_view_host_unittest.cc
@@ -134,13 +134,8 @@
                                               toplevel()->GetRootView(),
                                               test_view,
                                               host));
-#if defined(USE_AURA)
-  // One notification is generated from inserting the native view into the
-  // clipping window.
-  EXPECT_EQ(1, test_view->notification_count());
-#else
+
   EXPECT_EQ(0, test_view->notification_count());
-#endif
   test_view->ResetCount();
 
   // Detaching should send a NativeViewHierarchyChanged() notification and
@@ -155,15 +150,8 @@
   // reset the parent.
   host->Attach(child->GetNativeView());
   EXPECT_EQ(1, test_view->notification_count());
-#if defined(USE_AURA)
-  // There is a clipping window inserted above the native view that needs to be
-  // accounted for when looking at the relationship between the native views.
-  EXPECT_EQ(toplevel()->GetNativeView(),
-            GetNativeParent(GetNativeParent(child->GetNativeView())));
-#else
   EXPECT_EQ(toplevel()->GetNativeView(),
             GetNativeParent(child->GetNativeView()));
-#endif
 }
 
 // Verifies ViewHierarchyChanged handles NativeViewHost remove, add and move