Temporarily reverting class field and method name minification.

sdk/lib/_internal/compiler/implementation/lib/isolate_patch.dart

Index: sdk/lib/_internal/compiler/implementation/lib/isolate_patch.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/isolate_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/isolate_patch.dart
index 9c7b19d2173ff9fa4f679eda9747b65d3369c595..0711b7d790a648f5ef84e533ca4339127e5a6fb5 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/isolate_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/isolate_patch.dart
@@ -188,9 +188,9 @@ class _Manager {
   }
 
   void _nativeDetectEnvironment() {
-    JS("void", r"# = $isWorker", isWorker);
-    JS("void", r"# = $supportsWorkers", supportsWorkers);
-    JS("void", r"# = typeof(window) == 'undefined'", fromCommandLine);
+    JS("void", r"#.isWorker = $isWorker", this);
+    JS("void", r"#.supportsWorkers = $supportsWorkers", this);
+    JS("void", r"#.fromCommandLine = typeof(window) == 'undefined'", this);
   }
 
   void _nativeInitWorkerMessageHandler() {