dart2js: Rename old emitter to full emitter and make it its own library.

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

Index: pkg/compiler/lib/src/js_emitter/full_emitter/deferred_output_unit_hash.dart
diff --git a/pkg/compiler/lib/src/js_emitter/helpers.dart b/pkg/compiler/lib/src/js_emitter/full_emitter/deferred_output_unit_hash.dart
similarity index 68%
copy from pkg/compiler/lib/src/js_emitter/helpers.dart
copy to pkg/compiler/lib/src/js_emitter/full_emitter/deferred_output_unit_hash.dart
index a5591ace9b0bc766fc17068d788a55eb956d025a..8c79a8b20635f6d5505170ed3392434b964a0dcb 100644
--- a/pkg/compiler/lib/src/js_emitter/helpers.dart
+++ b/pkg/compiler/lib/src/js_emitter/full_emitter/deferred_output_unit_hash.dart
@@ -2,16 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-part of dart2js.js_emitter;
-
-ClassElement computeMixinClass(MixinApplicationElement mixinApplication) {
-  ClassElement mixin = mixinApplication.mixin;
-  while (mixin.isMixinApplication) {
-    mixinApplication = mixin;
-    mixin = mixinApplication.mixin;
-  }
-  return mixin;
-}
+part of dart2js.js_emitter.full_emitter;
 
 class _DeferredOutputUnitHash extends jsAst.DeferredString {
   String _hash;
@@ -30,4 +21,4 @@ class _DeferredOutputUnitHash extends jsAst.DeferredString {
   }
 
   String toString() => "HashCode for ${_outputUnit} [$_hash]";
-}
+}