Fix ScriptPreprocessor leak in inspector test case of LayoutTest.

Source/bindings/core/v8/PageScriptDebugServer.cpp

Index: Source/bindings/core/v8/PageScriptDebugServer.cpp
diff --git a/Source/bindings/core/v8/PageScriptDebugServer.cpp b/Source/bindings/core/v8/PageScriptDebugServer.cpp
index b4b8bfab77a13758072dfc13194def234bee1afb..f0f5a7660327676b4470f1cdd0e771388f6d07ac 100644
--- a/Source/bindings/core/v8/PageScriptDebugServer.cpp
+++ b/Source/bindings/core/v8/PageScriptDebugServer.cpp
@@ -308,6 +308,11 @@ String PageScriptDebugServer::preprocessEventListener(LocalFrame* frame, const S
     return m_scriptPreprocessor->preprocessSourceCode(source, url, functionName);
 }
 
+void PageScriptDebugServer::clearPreprocessor()
+{
+    m_scriptPreprocessor.clear();
+}
+
 void PageScriptDebugServer::muteWarningsAndDeprecations()
 {
     FrameConsole::mute();