Temporarily reverting class field and method name minification.

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index 9aa445dcb59148df3a683f92d4e37a383c37ac2b..fde47f1bcf04178b2807e1ad1372f9cd38d564e1 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -702,8 +702,10 @@ class JavaScriptBackend extends Backend {
 
   final RuntimeTypeInformation rti;
 
-  JavaScriptBackend(Compiler compiler, bool generateSourceMap, bool disableEval)
-      : namer = determineNamer(compiler),
+  JavaScriptBackend(Compiler compiler,
+                    bool generateSourceMap,
+                    bool disableEval)
+      : namer = new Namer(compiler),
         returnInfo = new Map<Element, ReturnInfo>(),
         invalidateAfterCodegen = new List<Element>(),
         interceptors = new Interceptors(compiler),
@@ -721,12 +723,6 @@ class JavaScriptBackend extends Backend {
     fieldTypes = new FieldTypesRegistry(this);
   }
 
-  static Namer determineNamer(Compiler compiler) {
-    return compiler.enableMinification ?
-        new MinifyNamer(compiler) :
-        new Namer(compiler);
-  }
-
   bool isInterceptorClass(Element element) {
     if (element == null) return false;
     return element == jsStringClass