Have Frame::navigationScheduler() return a reference

Source/web/WebFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2484 matching lines @@
         return;
 
     String script = decodeURLEscapeSequences(url.string().substring(strlen("javascript:")));
     UserGestureIndicator gestureIndicator(DefinitelyProcessingNewUserGesture);
     ScriptValue result = frame()->script()->executeScriptInMainWorldAndReturnValue(ScriptSourceCode(script));
 
     String scriptResult;
     if (!result.getString(scriptResult))
         return;
 
-    if (!frame()->navigationScheduler()->locationChangePending())
+    if (!frame()->navigationScheduler().locationChangePending())
         frame()->document()->loader()->replaceDocument(scriptResult, ownerDocument.get());
 }
 
 void WebFrameImpl::willDetachPage()
 {
     if (!frame() || !frame()->page())
         return;
 
     // Do not expect string scoping results from any frames that got detached
     // in the middle of the operation.
     if (m_scopingInProgress) {
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace WebKit