Disable all the tests that are flaking more than 5% on Linux builders.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
index 17e597c3854ca931e85788218cf49116290b3a80..62682e81332378fdf867da3c1a4b1957184e0308 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
@@ -472,7 +472,8 @@ TEST_F(DesktopWindowTreeHostX11Test, ToggleMinimizePropogateToContentWindow) {
 // Test that calling Widget::Deactivate() sets the widget as inactive wrt to
 // Chrome even if it not possible to deactivate the window wrt to the x server.
 // This behavior is required by several interactive_ui_tests.
-TEST_F(DesktopWindowTreeHostX11Test, Deactivate) {
+// http://crbug.com/396491
+TEST_F(DesktopWindowTreeHostX11Test, DISABLED_Deactivate) {
   scoped_ptr<Widget> widget(CreateWidget(NULL));
 
   ActivationWaiter waiter(