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

pkg/compiler/lib/src/js_emitter/code_emitter_task.dart

Index: pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
diff --git a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
index 9d700b3480bb1f42801ebb94f2add4b723a93758..0b9cdb2e3b5435c9fe1621785803466f36f6a2cc 100644
--- a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
+++ b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
@@ -40,7 +40,7 @@ class CodeEmitterTask extends CompilerTask {
     nativeEmitter = new NativeEmitter(this);
     emitter = USE_LAZY_EMITTER
         ? new lazy_js_emitter.Emitter(compiler, namer, nativeEmitter)
-        : new OldEmitter(compiler, namer, generateSourceMap, this);
+        : new full_js_emitter.Emitter(compiler, namer, generateSourceMap, this);
     metadataCollector = new MetadataCollector(compiler, emitter);
   }