Implement cancel() API on a Notification object so that script can cancel or ...

chrome/browser/notifications/notification_ui_manager.cc

Index: chrome/browser/notifications/notification_ui_manager.cc
===================================================================
--- chrome/browser/notifications/notification_ui_manager.cc	(revision 30967)
+++ chrome/browser/notifications/notification_ui_manager.cc	(working copy)
@@ -58,6 +58,18 @@
   CheckAndShowNotifications();
 }
 
+bool NotificationUIManager::Cancel(const Notification& notification) {
+  // First look through the notifications that haven't been shown.
+  NotificationDeque::iterator iter;
+  for (iter = show_queue_.begin(); iter != show_queue_.end(); ++iter) {
+    if (notification.IsSame((*iter)->notification())) {
+      show_queue_.erase(iter);
+      return true;
+    }
+  }
+  return balloon_collection_->Remove(notification);
+}
+
 void NotificationUIManager::CheckAndShowNotifications() {
   // TODO(johnnyg): http://crbug.com/25061 - Check for user idle/presentation.
   ShowNotifications();