binding: Makes XxxObserverCallback use V8PrivateProperty instead of V8HiddenValue.

third_party/WebKit/Source/bindings/core/v8/V8PerformanceObserverCallback.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8PerformanceObserverCallback.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8PerformanceObserverCallback.cpp b/third_party/WebKit/Source/bindings/core/v8/V8PerformanceObserverCallback.cpp
index 8ef9ca9c6a6db9bdaf5b39b0d6e61ffded826b4f..13e9610523ade8cd7bcfe687f81825c39d6c988c 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8PerformanceObserverCallback.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8PerformanceObserverCallback.cpp
@@ -10,6 +10,7 @@
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8PerformanceObserver.h"
 #include "bindings/core/v8/V8PerformanceObserverEntryList.h"
+#include "bindings/core/v8/V8PrivateProperty.h"
 #include "core/dom/ExecutionContext.h"
 #include "wtf/Assertions.h"
 
@@ -20,8 +21,8 @@ V8PerformanceObserverCallback::V8PerformanceObserverCallback(v8::Local<v8::Funct
     , m_callback(scriptState->isolate(), callback)
     , m_scriptState(scriptState)
 {
-    V8HiddenValue::setHiddenValue(scriptState, owner, V8HiddenValue::callback(scriptState->isolate()), callback);
-    m_callback.setWeak(this, &setWeakCallback);
+    V8PrivateProperty::getPerformanceObserverCallback(scriptState->isolate()).set(scriptState->context(), owner, callback);
+    m_callback.setPhantom();
 }
 
 V8PerformanceObserverCallback::~V8PerformanceObserverCallback()
@@ -61,11 +62,6 @@ void V8PerformanceObserverCallback::handleEvent(PerformanceObserverEntryList* en
     ScriptController::callFunction(m_scriptState->getExecutionContext(), m_callback.newLocal(m_scriptState->isolate()), thisObject, 2, argv, m_scriptState->isolate());
 }
 
-void V8PerformanceObserverCallback::setWeakCallback(const v8::WeakCallbackInfo<V8PerformanceObserverCallback>& data)
-{
-    data.GetParameter()->m_callback.clear();
-}
-
 DEFINE_TRACE(V8PerformanceObserverCallback)
 {
     PerformanceObserverCallback::trace(visitor);