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

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

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // 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;
+part of dart2js.js_emitter.full_emitter;
 
 /// Enables debugging of fast/slow objects using V8-specific primitives.
 const DEBUG_FAST_OBJECTS = false;
 
 /**
  * Call-back for adding property with [name] and [value].
  */
 typedef jsAst.Property AddPropertyFunction(jsAst.Name name,
                                            jsAst.Expression value);
 
-// Function signatures used in the generation of runtime type information.
-typedef void FunctionTypeSignatureEmitter(Element method,
-                                          FunctionType methodType);
-
-typedef void SubstitutionEmitter(Element element, {bool emitNull});
-
 const String GENERATED_BY = """
 // Generated by dart2js, the Dart to JavaScript compiler.
 """;
 
 const String HOOKS_API_USAGE = """
 // The code supports the following hooks:
 // dartPrint(message):
 //    if this function is defined it is called instead of the Dart [print]
 //    method.
 //
@@ skipping 24 matching lines @@
 // characters.
 const FIELD_CODE_CHARACTERS = r"<=>?@{|}~%&'()*";
 const NO_FIELD_CODE = 0;
 const FIRST_FIELD_CODE = 1;
 const RANGE1_FIRST = 0x3c;   //  <=>?@    encodes 1..5
 const RANGE1_LAST = 0x40;
 const RANGE2_FIRST = 0x7b;   //  {|}~     encodes 6..9
 const RANGE2_LAST = 0x7e;
 const RANGE3_FIRST = 0x25;   //  %&'()*+  encodes 10..16
 const RANGE3_LAST = 0x2b;