Fix ScriptPreprocessor leak in inspector test case of LayoutTest.

Source/bindings/core/v8/PageScriptDebugServer.cpp

 /*
  * Copyright (c) 2011 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 290 matching lines @@
 }
 
 String PageScriptDebugServer::preprocessEventListener(LocalFrame* frame, const String& source, const String& url, const String& functionName)
 {
     if (!canPreprocess(frame))
         return source;
 
     return m_scriptPreprocessor->preprocessSourceCode(source, url, functionName);
 }
 
+void PageScriptDebugServer::clearPreprocessor()
+{
+    m_scriptPreprocessor.clear();
+}
+
 void PageScriptDebugServer::muteWarningsAndDeprecations()
 {
     FrameConsole::mute();
     UseCounter::muteForInspector();
 }
 
 void PageScriptDebugServer::unmuteWarningsAndDeprecations()
 {
     FrameConsole::unmute();
     UseCounter::unmuteForInspector();
 }
 
 } // namespace blink