Correctly restore fullscreen window bounds when leaving overview mode.

ash/common/wm/overview/window_selector.cc

Index: ash/common/wm/overview/window_selector.cc
diff --git a/ash/common/wm/overview/window_selector.cc b/ash/common/wm/overview/window_selector.cc
index c77b297a6508bc2e0600eadddaf46864f974e7a5..2f2103e9a4e99c11887b8f85de4b83d730e9aa3d 100644
--- a/ash/common/wm/overview/window_selector.cc
+++ b/ash/common/wm/overview/window_selector.cc
@@ -539,8 +539,12 @@ void WindowSelector::OnDisplayRemoved(const display::Display& display) {
 
 void WindowSelector::OnDisplayMetricsChanged(const display::Display& display,
                                              uint32_t metrics) {
-  PositionWindows(/* animate */ false);
-  RepositionTextFilterOnDisplayMetricsChange();
+  // If only the work area changes, there is no need to reposition windows in
+  // overview.
+  if (metrics != DISPLAY_METRIC_WORK_AREA) {
+    PositionWindows(/* animate */ false);
+    RepositionTextFilterOnDisplayMetricsChange();
+  }
 }
 
 void WindowSelector::OnWindowTreeChanged(WmWindow* window,