Update isolate documentation.

runtime/vm/snapshot.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 1347 matching lines @@
   // Write out the individual object ids.
   for (intptr_t i = 0; i < len; i++) {
     WriteObjectRef(data[i]);
   }
 }
 
 
 void SnapshotWriter::CheckIfSerializable(RawClass* cls) {
   if (Class::IsSignatureClass(cls)) {
     // We do not allow closure objects in an isolate message.
-    SetWriteException(Exceptions::kArgument,
+    SetWriteException(Exceptions::kIsolateMessage,
                       "Illegal argument in isolate message"
                       " : (object is a closure)");
   }
   if (cls->ptr()->num_native_fields_ != 0) {
     // We do not allow objects with native fields in an isolate message.
-    SetWriteException(Exceptions::kArgument,
+    SetWriteException(Exceptions::kIsolateMessage,
                       "Illegal argument in isolate message"
                       " : (object extends NativeWrapper)");
   }
 }
 
 
 void SnapshotWriter::SetWriteException(Exceptions::ExceptionType type,
                                        const char* msg) {
   set_exception_type(type);
   set_exception_msg(msg);
@@ skipping 131 matching lines @@
     UnmarkAll();
     isolate->set_long_jump_base(base);
   } else {
     isolate->set_long_jump_base(base);
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart