MacViews: Fix WidgetTest.WidgetDeleted_InOnMousePressed

ui/views/test/event_generator_delegate_mac.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/scoped_nsobject.h"
 #import "base/mac/scoped_objc_class_swizzler.h"
 #include "base/memory/singleton.h"
 #include "ui/events/event_processor.h"
@@ skipping 262 matching lines @@
   void ConvertPointFromHost(const ui::EventTarget* hosted_target,
                             gfx::Point* point) const override {}
 
  private:
   friend struct DefaultSingletonTraits<EventGeneratorDelegateMac>;
 
   EventGeneratorDelegateMac();
   ~EventGeneratorDelegateMac() override;
 
   ui::test::EventGenerator* owner_;
-  NSWindow* window_;
+  base::scoped_nsobject<NSWindow> window_;
   scoped_ptr<base::mac::ScopedObjCClassSwizzler> swizzle_pressed_;
   scoped_ptr<base::mac::ScopedObjCClassSwizzler> swizzle_current_event_;
   base::scoped_nsobject<NSMenu> fake_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(EventGeneratorDelegateMac);
 };
 
-EventGeneratorDelegateMac::EventGeneratorDelegateMac()
-    : owner_(NULL),
-      window_(NULL) {
+EventGeneratorDelegateMac::EventGeneratorDelegateMac() : owner_(NULL) {
   DCHECK(!ui::test::EventGenerator::default_delegate);
   ui::test::EventGenerator::default_delegate = this;
   // Install a fake "edit" menu. This is normally provided by Chrome's
   // MainMenu.xib, but src/ui shouldn't depend on that.
   fake_menu_.reset([[NSMenu alloc] initWithTitle:@"Edit"]);
   struct {
     NSString* title;
     SEL action;
     NSString* key_equivalent;
   } fake_menu_item[] = {
@@ skipping 51 matching lines @@
 
   EmulateSendEvent(window_, ns_event);
 }
 
 void EventGeneratorDelegateMac::SetContext(ui::test::EventGenerator* owner,
                                            gfx::NativeWindow root_window,
                                            gfx::NativeWindow window) {
   swizzle_pressed_.reset();
   swizzle_current_event_.reset();
   owner_ = owner;
-  window_ = window;
+
+  // Retain the NSWindow (note it can be nil). This matches Cocoa's tendency to
+  // have autoreleased objects, or objects still in the event queue, that
+  // reference the NSWindow.
+  window_.reset([window retain]);
 
   // Normally, edit menu items have a `nil` target. This results in -[NSMenu
   // performKeyEquivalent:] relying on -[NSApplication targetForAction:to:from:]
   // to find a target starting at the first responder of the key window. Since
   // non-interactive tests have no key window, that won't work. So set (or
   // clear) the target explicitly on all menu items.
   [[fake_menu_ itemArray] makeObjectsPerformSelector:@selector(setTarget:)
                                           withObject:[window firstResponder]];
 
   if (owner_) {
@@ skipping 58 matching lines @@
 - (NSEvent*)currentEvent {
   if (g_current_event)
     return g_current_event;
 
   // Find the original implementation and invoke it.
   IMP original = EventGeneratorDelegateMac::GetInstance()->CurrentEventMethod();
   return original(self, _cmd);
 }
 
 @end