Comment-only change to track down some svn issues I'm having.

runtime/vm/dart_api_impl.h

Index: runtime/vm/dart_api_impl.h
===================================================================
--- runtime/vm/dart_api_impl.h	(revision 3159)
+++ runtime/vm/dart_api_impl.h	(working copy)
@@ -92,10 +92,10 @@
   static PersistentHandle* UnwrapAsPersistentHandle(const ApiState& state,
                                                     Dart_Handle object);
 
-  // Cast the internal Isolate* type to the external Dart_Isolate type.
+  // Casts the internal Isolate* type to the external Dart_Isolate type.
   static Dart_Isolate CastIsolate(Isolate* isolate);
 
-  // Cast a message byte array to the external Dart_Message type.
+  // Casts a message byte array to the external Dart_Message type.
   static Dart_Message CastMessage(uint8_t* message);
 
   // Gets the handle used to designate successful return.