Remove macro-generated functions for private properties of MessageChannel

This CL removes macro-generated functions for private properties of MessageChannel by using the new API GetSymbol created in CL1877490.

Bug: 715418
Change-Id: I913997334d77807bedc5d2cc8022788c0daa80fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888616
Commit-Queue: Marina Sakai <marinasakai@google.com>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711183}

third_party/blink/renderer/bindings/core/v8/custom/v8_message_channel_custom.cc

@@ -39,6 +39,9 @@
 
 namespace blink {
 
+const V8PrivateProperty::SymbolKey kSymbolKeyPort1;
+const V8PrivateProperty::SymbolKey kSymbolKeyPort2;
+
 void V8MessageChannel::ConstructorCustom(
     const v8::FunctionCallbackInfo<v8::Value>& info) {
   v8::Isolate* isolate = info.GetIsolate();
@@ -51,10 +54,10 @@ void V8MessageChannel::ConstructorCustom(
   // Create references from the MessageChannel wrapper to the two
   // MessagePort wrappers to make sure that the MessagePort wrappers
   // stay alive as long as the MessageChannel wrapper is around.
-  V8PrivateProperty::GetMessageChannelPort1(isolate).Set(
-      wrapper, ToV8(channel->port1(), wrapper, isolate));
-  V8PrivateProperty::GetMessageChannelPort2(isolate).Set(
-      wrapper, ToV8(channel->port2(), wrapper, isolate));
+  V8PrivateProperty::GetSymbol(isolate, kSymbolKeyPort1)
+      .Set(wrapper, ToV8(channel->port1(), wrapper, isolate));
+  V8PrivateProperty::GetSymbol(isolate, kSymbolKeyPort2)
+      .Set(wrapper, ToV8(channel->port2(), wrapper, isolate));
 
   V8SetReturnValue(info, V8DOMWrapper::AssociateObjectWithWrapper(
                              isolate, channel, GetWrapperTypeInfo(), wrapper));

third_party/blink/renderer/platform/bindings/v8_private_property.h

@@ -31,8 +31,6 @@ class ScriptWrappable;
   X(DOMException, Error)                                \
   X(Global, Event)                                      \
   X(IDBCursor, Request)                                 \
-  X(MessageChannel, Port1)                              \
-  X(MessageChannel, Port2)                              \
   X(MessageEvent, CachedData)                           \
   X(NamedConstructor, Initialized)                      \
   X(PopStateEvent, State)                               \