Launch panels as popup windows in Aura, and add separate launcher icon logic for panels.

chrome/browser/ui/views/browser_actions_container.cc

Index: chrome/browser/ui/views/browser_actions_container.cc
diff --git a/chrome/browser/ui/views/browser_actions_container.cc b/chrome/browser/ui/views/browser_actions_container.cc
index ef3dd6e7008693358b448560840b4d8e19296beb..b014d1f5ebd14e86aaf75f4811276d4d14dd00e5 100644
--- a/chrome/browser/ui/views/browser_actions_container.cc
+++ b/chrome/browser/ui/views/browser_actions_container.cc
@@ -813,8 +813,12 @@ void BrowserActionsContainer::InspectPopup(ExtensionAction* action) {
 }
 
 void BrowserActionsContainer::OnWidgetClosing(views::Widget* widget) {
-  DCHECK_EQ(popup_->GetWidget(), widget);
-  popup_->GetWidget()->RemoveObserver(this);
+  // Always remove this as an observer of a closing popup.
+  widget->RemoveObserver(this);
+  // If a new popup has been opened before this gets called, |popup_| will
+  // point to the new popup, so just return.
+  if (!popup_ || popup_->GetWidget() != widget)
+    return;
   popup_ = NULL;
   // |popup_button_| is NULL if the extension has been removed.
   if (popup_button_) {
@@ -834,9 +838,15 @@ void BrowserActionsContainer::MoveBrowserAction(const std::string& extension_id,
 }
 
 void BrowserActionsContainer::HidePopup() {
+  // Remove this as an observer and clear |popup_| and |popup_button_| here,
+  // since we might change them before OnWidgetClosing() gets called.
   if (popup_) {
+    popup_->GetWidget()->RemoveObserver(this);
     popup_->GetWidget()->Close();
-    // NULL out popup_button_ in case it's being deleted.
+    popup_ = NULL;
+  }
+  if (popup_button_) {
+    popup_button_->SetButtonNotPushed();
     popup_button_ = NULL;
   }
 }