Make ScriptStreamer and dependents Oilpan friendly.

Source/core/inspector/InspectorInstrumentationCustomInl.h

Index: Source/core/inspector/InspectorInstrumentationCustomInl.h
diff --git a/Source/core/inspector/InspectorInstrumentationCustomInl.h b/Source/core/inspector/InspectorInstrumentationCustomInl.h
index efc4dcc71ab3840815dca31fe9ffc485c923dcb6..b9b684433385292c147d4ba56e7854c03bae3f11 100644
--- a/Source/core/inspector/InspectorInstrumentationCustomInl.h
+++ b/Source/core/inspector/InspectorInstrumentationCustomInl.h
@@ -39,7 +39,7 @@ namespace InspectorInstrumentation {
 
 bool isDebuggerPausedImpl(InstrumentingAgents*);
 bool collectingHTMLParseErrorsImpl(InstrumentingAgents*);
-PassOwnPtr<ScriptSourceCode> preprocessImpl(InstrumentingAgents*, LocalFrame*, const ScriptSourceCode&);
+Nullable<ScriptSourceCode> preprocessImpl(InstrumentingAgents*, LocalFrame*, const ScriptSourceCode&);
 String preprocessEventListenerImpl(InstrumentingAgents*, LocalFrame*, const String& source, const String& url, const String& functionName);
 void appendAsyncCallStack(ExecutionContext*, ScriptCallStack*);
 
@@ -70,16 +70,16 @@ inline String preprocessEventListener(LocalFrame* frame, const String& source, c
     return source;
 }
 
-inline PassOwnPtr<ScriptSourceCode> preprocess(LocalFrame* frame, const ScriptSourceCode& sourceCode)
+inline Nullable<ScriptSourceCode> preprocess(LocalFrame* frame, const ScriptSourceCode& sourceCode)
 {
-    FAST_RETURN_IF_NO_FRONTENDS(PassOwnPtr<ScriptSourceCode>());
+    FAST_RETURN_IF_NO_FRONTENDS(nullptr);
     if (InstrumentingAgents* instrumentingAgents = instrumentingAgentsFor(frame))
         return preprocessImpl(instrumentingAgents, frame, sourceCode);
-    return PassOwnPtr<ScriptSourceCode>();
+    return nullptr;
 }
 
 } // namespace InspectorInstrumentation
 
 } // namespace blink
 
-#endif // !defined(InspectorInstrumentationCustom_inl_h)
+#endif // InspectorInstrumentationCustom_inl_h