[Mac] Prevent script-initiated tab close while a content select menu is up.

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2006-2008 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 "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
+#import "base/chrome_application_mac.h"
 #include "base/histogram.h"
 #import "base/scoped_nsobject.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/browser_trial.h"
 #import "chrome/browser/cocoa/rwhvm_editcommand_helper.h"
 #include "chrome/browser/plugin_process_host.h"
 #include "chrome/browser/renderer_host/backing_store_mac.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
@@ skipping 383 matching lines @@
   NSRect position = NSMakeRect(bounds.x(), parent_rect.size.height - y_offset,
                                bounds.width(), bounds.height());
 
   // Display the menu.
   scoped_nsobject<WebMenuRunner> menu_runner;
   menu_runner.reset([[WebMenuRunner alloc] initWithItems:items]);
 
   {
     // Make sure events can be pumped while the menu is up.
     MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
+
+    // One of the events that could be pumped is |window.close()|.
+    // User-initiated event-tracking loops protect against this by
+    // setting flags in -[CrApplication sendEvent:], but since
+    // web-content menus are initiated by IPC message the setup has to
+    // be done manually.
+    chrome_application_mac::ScopedSendingEvent sendingEventScoper;
+
     [menu_runner runMenuInView:parent_view_
                     withBounds:position
                   initialIndex:selected_item];
   }
 
   int window_num = [[parent_view_ window] windowNumber];
   NSEvent* event =
       webkit_glue::EventWithMenuAction([menu_runner menuItemWasChosen],
                                        window_num, item_height,
                                        [menu_runner indexOfSelectedItem],
@@ skipping 977 matching lines @@
     event.skip_in_browser = true;
     renderWidgetHostView_->render_widget_host_->ForwardKeyboardEvent(event);
   } else {
     renderWidgetHostView_->render_widget_host_->ImeConfirmComposition(
         UTF8ToUTF16([im_text UTF8String]));
   }
   renderWidgetHostView_->im_composing_ = false;
 }
 
 @end