Improve panel related tests to make them more reliable

chrome/browser/ui/panels/panel_manager.cc

Index: chrome/browser/ui/panels/panel_manager.cc
diff --git a/chrome/browser/ui/panels/panel_manager.cc b/chrome/browser/ui/panels/panel_manager.cc
index d454d4f307464c8a9b18fd25627af88a8e4ac0e8..df7d4aadda69ec4c467d82a7cc120c1e8a9ee9c9 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -286,13 +286,8 @@ PanelCollection* PanelManager::GetCollectionForNewPanel(
     const gfx::Rect& bounds,
     CreateMode mode,
     PanelCollection::PositioningMask* positioning_mask) {
-  if (mode == CREATE_AS_DOCKED) {
-    // Delay layout refreshes in case multiple panels are created within
-    // a short time of one another or the focus changes shortly after panel
-    // is created to avoid excessive screen redraws.
-    *positioning_mask = PanelCollection::DELAY_LAYOUT_REFRESH;
+  if (mode == CREATE_AS_DOCKED)
     return docked_collection_.get();
-  }
 
   DCHECK_EQ(CREATE_AS_DETACHED, mode);
   *positioning_mask = PanelCollection::DEFAULT_POSITION;