Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/modules/notifications/DOMWindowNotifications.cpp

Index: Source/modules/notifications/DOMWindowNotifications.cpp
diff --git a/Source/modules/notifications/DOMWindowNotifications.cpp b/Source/modules/notifications/DOMWindowNotifications.cpp
index 9a64fb4191b9f38414c8ca2d7872f5d0b21b9092..4d2f569f09969be7e765269c316b2d4060517c13 100644
--- a/Source/modules/notifications/DOMWindowNotifications.cpp
+++ b/Source/modules/notifications/DOMWindowNotifications.cpp
@@ -90,14 +90,14 @@ NotificationCenter* DOMWindowNotifications::webkitNotifications()
     Document* document = m_window->document();
     if (!document)
         return 0;
-    
+
     Page* page = document->page();
     if (!page)
         return 0;
 
     NotificationClient* provider = NotificationController::clientFrom(page);
-    if (provider) 
-        m_notificationCenter = NotificationCenter::create(document, provider);    
+    if (provider)
+        m_notificationCenter = NotificationCenter::create(document, provider);
 
     return m_notificationCenter.get();
 }