dart2js: Move functionThatReturnsNull to Isolate.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
index bb2f2b2aa991b4c9480a7f19d0deb7b313bae4a1..bf3a7b9479cdbbfe863356f9d0f1674a03e16512 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
@@ -733,12 +733,14 @@ class OldEmitter implements Emitter {
   }
 
   jsAst.Statement buildFunctionThatReturnsNull() {
-    return js.statement('# = function() {}',
-                        [backend.rti.getFunctionThatReturnsNullName]);
+    return js.statement('#.# = function() {}',
+                        [namer.isolateName,
+                         backend.rti.getFunctionThatReturnsNullName]);
   }
 
   jsAst.Expression generateFunctionThatReturnsNull() {
-    return js("#", [backend.rti.getFunctionThatReturnsNullName]);
+    return js("#.#", [namer.isolateName,
+                      backend.rti.getFunctionThatReturnsNullName]);
   }
 
   buildMain(jsAst.Statement invokeMain) {
@@ -878,6 +880,8 @@ class OldEmitter implements Emitter {
           if (#outputContainsConstantList) {
             Isolate.#makeConstListProperty = oldIsolate.#makeConstListProperty;
           }
+          Isolate.#functionThatReturnsNullProperty =
+              oldIsolate.#functionThatReturnsNullProperty;
           if (#hasIncrementalSupport) {
             Isolate.#lazyInitializerProperty =
                 oldIsolate.#lazyInitializerProperty;
@@ -895,6 +899,8 @@ class OldEmitter implements Emitter {
             'isolatePropertiesName': namer.isolatePropertiesName,
             'outputContainsConstantList': task.outputContainsConstantList,
             'makeConstListProperty': makeConstListProperty,
+            'functionThatReturnsNullProperty':
+                backend.rti.getFunctionThatReturnsNullName,
             'hasIncrementalSupport': compiler.hasIncrementalSupport,
             'lazyInitializerProperty': lazyInitializerProperty,});
   }