Fix Linux panels to return to minimized mode after mouse moves away.

chrome/browser/ui/panels/old_panel_drag_browsertest.cc

Index: chrome/browser/ui/panels/old_panel_drag_browsertest.cc
diff --git a/chrome/browser/ui/panels/old_panel_drag_browsertest.cc b/chrome/browser/ui/panels/old_panel_drag_browsertest.cc
index 72858b6562137912361406d3722fd782666e122d..ab832f74e7f0c89d893db72add16a404ac7afea2 100644
--- a/chrome/browser/ui/panels/old_panel_drag_browsertest.cc
+++ b/chrome/browser/ui/panels/old_panel_drag_browsertest.cc
@@ -480,6 +480,11 @@ IN_PROC_BROWSER_TEST_F(OldPanelDragBrowserTest,
   EXPECT_FALSE(panel->IsDrawingAttention());
   EXPECT_EQ(Panel::TITLE_ONLY, panel->expansion_state());
 
+  // Typical user scenario will detect the mouse in the panel
+  // after attention is cleared, causing titles to pop up, so
+  // we simulate that here.
+  MoveMouse(mouse_location);
+
   // Verify panel returns to fully minimized state after dragging ends once
   // mouse moves away from the panel.
   panel_testing->FinishDragTitlebar();