Context menu on views must show on mouse down for non-WIN.

ui/views/widget/root_view.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/widget/root_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 415 matching lines @@
     // See if this view wants to handle the mouse press.
     ui::MouseEvent mouse_pressed_event(event, static_cast<View*>(this),
                                        mouse_pressed_handler_);
 
     // Remove the double-click flag if the handler is different than the
     // one which got the first click part of the double-click.
     if (mouse_pressed_handler_ != last_click_handler_)
       mouse_pressed_event.set_flags(event.flags() & ~ui::EF_IS_DOUBLE_CLICK);
 
     drag_info_.Reset();
-    DispatchEventToTarget(mouse_pressed_handler_, &mouse_pressed_event);
+    {
+      WidgetDeletionObserver widget_deletion_observer(widget_);
+      DispatchEventToTarget(mouse_pressed_handler_, &mouse_pressed_event);
+      if (!widget_deletion_observer.IsWidgetAlive())
+        return mouse_pressed_event.handled();
+    }
 
     // The view could have removed itself from the tree when handling
     // OnMousePressed().  In this case, the removal notification will have
     // reset mouse_pressed_handler_ to NULL out from under us.  Detect this
     // case and stop.  (See comments in view.h.)
     //
     // NOTE: Don't return true here, because we don't want the frame to
     // forward future events to us when there's no handler.
     if (!mouse_pressed_handler_)
       break;
@@ skipping 245 matching lines @@
     DispatchEventToTarget(p, &notify_event);
   }
 }
 
 bool RootView::CanDispatchToTarget(ui::EventTarget* target) {
   return event_dispatch_target_ == target;
 }
 
 }  // namespace internal
 }  // namespace views