Oilpan: avoid InjectedScriptManager::CallbackData-induced leaks.

Source/core/inspector/InjectedScriptManager.cpp

Index: Source/core/inspector/InjectedScriptManager.cpp
diff --git a/Source/core/inspector/InjectedScriptManager.cpp b/Source/core/inspector/InjectedScriptManager.cpp
index be69c72baf3d0bc136772fc807ca87648d82f49e..7cb1ac0dc3013df2866de8bf2436dd756bd1e390 100644
--- a/Source/core/inspector/InjectedScriptManager.cpp
+++ b/Source/core/inspector/InjectedScriptManager.cpp
@@ -68,6 +68,9 @@ InjectedScriptManager::~InjectedScriptManager()
 DEFINE_TRACE(InjectedScriptManager)
 {
     visitor->trace(m_injectedScriptHost);
+#if ENABLE(OILPAN)
+    visitor->trace(m_callbackDataSet);
+#endif
 }
 
 void InjectedScriptManager::disconnect()
@@ -185,5 +188,26 @@ InjectedScript InjectedScriptManager::injectedScriptFor(ScriptState* inspectedSc
     return result;
 }
 
-} // namespace blink
+PassOwnPtrWillBeRawPtr<InjectedScriptManager::CallbackData> InjectedScriptManager::CallbackData::create(InjectedScriptManager* manager)
+{
+    return adoptPtrWillBeNoop(new CallbackData(manager));
+}
 
+InjectedScriptManager::CallbackData::CallbackData(InjectedScriptManager* manager)
+    : injectedScriptManager(manager)
+{
+}
+
+void InjectedScriptManager::CallbackData::dispose()
+{
+    // Promptly release the ScopedPersistent<>.
+    handle.clear();
+}
+
+DEFINE_TRACE(InjectedScriptManager::CallbackData)
+{
+    visitor->trace(host);
+    visitor->trace(injectedScriptManager);
+}
+
+} // namespace blink