Remove dependency on Vector from platform files

src/extensions/gc-extension.h

Index: src/extensions/gc-extension.h
diff --git a/src/extensions/gc-extension.h b/src/extensions/gc-extension.h
index a6fde3b60c44ef8489f6275d600006dd872d5a60..789354597e5ffdea6b1124274ede4b3e40b1c732 100644
--- a/src/extensions/gc-extension.h
+++ b/src/extensions/gc-extension.h
@@ -22,8 +22,8 @@ class GCExtension : public v8::Extension {
 
  private:
   static const char* BuildSource(char* buf, size_t size, const char* fun_name) {
-    OS::SNPrintF(Vector<char>(buf, static_cast<int>(size)),
-                 "native function %s();", fun_name);
+    SNPrintF(Vector<char>(buf, static_cast<int>(size)),
+             "native function %s();", fun_name);
     return buf;
   }