[Bindings] Replace V8HiddenValue in generated code with V8PrivateProperty

third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h

Index: third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h b/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
index e6a1fdff4e79929855e6928f685656811909c5c3..24fc590a060c690e2dc9513ecbaa8254e6f3777b 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
@@ -39,6 +39,7 @@ class ScriptWrappable;
   X(MutationObserver, Callback)                       \
   X(NamedConstructor, Initialized)                    \
   X(PerformanceObserver, Callback)                    \
+  X(PopStateEvent, State)                             \
   X(SameObject, NotificationActions)                  \
   X(SameObject, NotificationData)                     \
   X(SameObject, NotificationVibrate)                  \
@@ -168,7 +169,7 @@ class CORE_EXPORT V8PrivateProperty {
         privateProp->m_symbolWindowDocumentCachedAccessor.newLocal(isolate));
   }
 
-  static Symbol createSymbol(v8::Isolate* isolate, const char* symbol) {
+  static Symbol getSymbol(v8::Isolate* isolate, const char* symbol) {
     return Symbol(isolate, createCachedV8Private(isolate, symbol));
   }
 
@@ -177,6 +178,7 @@ class CORE_EXPORT V8PrivateProperty {
 
   static v8::Local<v8::Private> createV8Private(v8::Isolate*,
                                                 const char* symbol);
+  // TODO(peria): Remove this method. We should not use v8::Private::ForApi().
   static v8::Local<v8::Private> createCachedV8Private(v8::Isolate*,
                                                       const char* symbol);