Fix the problem that notifications and panels overlap.

chrome/browser/ui/panels/base_panel_browser_test.cc

Index: chrome/browser/ui/panels/base_panel_browser_test.cc
diff --git a/chrome/browser/ui/panels/base_panel_browser_test.cc b/chrome/browser/ui/panels/base_panel_browser_test.cc
index 037a52f5f4fbfb4281267e882b77d79ff0cebd43..b08b9590596729a1d3d8cf1b76a0a7c03ffd29cb 100644
--- a/chrome/browser/ui/panels/base_panel_browser_test.cc
+++ b/chrome/browser/ui/panels/base_panel_browser_test.cc
@@ -174,7 +174,10 @@ void BasePanelBrowserTest::SetUpOnMainThread() {
   mock_auto_hiding_desktop_bar_ = new MockAutoHidingDesktopBarImpl(
       panel_manager);
   panel_manager->set_auto_hiding_desktop_bar(mock_auto_hiding_desktop_bar_);
-  panel_manager->SetWorkAreaForTesting(testing_work_area_);
+  // Do not use the testing work area if it is empty since we're going to
+  // use the actual work area in some testing scenarios.
+  if (!testing_work_area_.IsEmpty())
+    panel_manager->SetWorkAreaForTesting(testing_work_area_);
   panel_manager->enable_auto_sizing(false);
   panel_manager->remove_delays_for_testing();
   // This is needed so the subsequently created panels can be activated.