Run the "Relaunch Chrome" dialog test everywhere.

ui/views/test/widget_test_unittest.cc

Index: ui/views/test/widget_test_unittest.cc
diff --git a/ui/views/test/widget_test_unittest.cc b/ui/views/test/widget_test_unittest.cc
index b4d8ea50364dcfb00e521e1fccc117cbaf0b1fdd..05f8c1d770aa541a1345b7f414d51b1a9489048c 100644
--- a/ui/views/test/widget_test_unittest.cc
+++ b/ui/views/test/widget_test_unittest.cc
@@ -9,6 +9,10 @@
 
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if defined(USE_AURA)
+#include "ui/aura/window.h"
+#endif
+
 namespace views {
 namespace test {
 namespace {
@@ -69,6 +73,16 @@ TEST_F(WidgetTestTest, GetAllWidgets) {
   Widget* desktop_child = CreateChildNativeWidgetWithParent(desktop);
   ExpectAdd(&expected, desktop_child, "desktop_child");
 
+#if defined(USE_AURA)
+  // A DesktopWindowTreeHost has both a root aura::Window and a content window.
+  // DesktopWindowTreeHostX11::GetAllOpenWindows() returns content windows, so
+  // ensure that a Widget parented to the root window is also found.
+  Widget* desktop_cousin =
+      CreateChildPlatformWidget(desktop->GetNativeView()->GetRootWindow());
+  ExpectAdd(&expected, desktop_cousin, "desktop_cousin");
+  ExpectClose(&expected, {desktop_cousin}, "desktop_cousin");
+#endif  // USE_AURA
+
   ExpectClose(&expected, {desktop, desktop_child}, "desktop");
   ExpectClose(&expected, {native, native_child}, "native");
   ExpectClose(&expected, {platform, platform_child}, "platform");