Avoid trusting the length encoded in the Snapshot if there is an

runtime/vm/dart_api_message.cc

Index: runtime/vm/dart_api_message.cc
===================================================================
--- runtime/vm/dart_api_message.cc	(revision 11409)
+++ runtime/vm/dart_api_message.cc	(working copy)
@@ -478,8 +478,6 @@
   for (int i = 0; i < field_count; i++) {
     Write<RawObject*>(Integer::New(data[i]));
   }
-
-  FinalizeBuffer();
 }
 
 
@@ -622,7 +620,7 @@
     }
     return;
   }
-  return WriteCObjectInlined(object, type);
+  WriteCObjectInlined(object, type);
 }
 
 
@@ -645,7 +643,7 @@
     AddToForwardList(object);
     return;
   }
-  return WriteCObjectInlined(object, type);
+  WriteCObjectInlined(object, type);
 }
 
 
@@ -782,7 +780,6 @@
     WriteForwardedCObject(forward_list_[i]);
   }
   UnmarkAllCObjects(object);
-  FinalizeBuffer();
 }
 
 }  // namespace dart