dart2js: More documentation for embedded globals and properties.

pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.dart

Index: pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.dart
diff --git a/pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.dart
index aa30bd90f6f929bc284766c466297ccea4d2e5c8..4e3cb5fa4bea1c5530c10a957fad94dd62958451 100644
--- a/pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.dart
@@ -279,7 +279,7 @@ function $setupProgramName(programData, typesOffset) {
 
       #initializeEmptyInstance = function(name, o, fields) {
         #allClasses[name].apply(o, fields);
-        return o; //
+        return o;
       }
     }