Move runtime helper for JSSet and JSMap onto objects.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index c73860f70688608df90cdea913ebe7d14513da69..22b9dafa4b1a07c739cda5b7ddc80756ce8c74bc 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6153,7 +6153,7 @@ void Map::Clear() {
   i::Isolate* isolate = self->GetIsolate();
   LOG_API(isolate, "Map::Clear");
   ENTER_V8(isolate);
-  i::Runtime::JSMapClear(isolate, self);
+  i::JSMap::Clear(self);
 }
 
 
@@ -6269,7 +6269,7 @@ void Set::Clear() {
   i::Isolate* isolate = self->GetIsolate();
   LOG_API(isolate, "Set::Clear");
   ENTER_V8(isolate);
-  i::Runtime::JSSetClear(isolate, self);
+  i::JSSet::Clear(self);
 }
 
 
@@ -6535,7 +6535,7 @@ void v8::ArrayBuffer::Neuter() {
                   "Only neuterable ArrayBuffers can be neutered");
   LOG_API(obj->GetIsolate(), "v8::ArrayBuffer::Neuter()");
   ENTER_V8(isolate);
-  i::Runtime::NeuterArrayBuffer(obj);
+  obj->Neuter();
 }