Remove rhino - it's no longer used anywhere.

compiler/dart-compiler.gyp

 # Copyright (c) 2012, 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.
 
 {
   'includes': [
     'sources.gypi',
     'test_sources.gypi',
     'corelib_sources.gypi',
     'compiler_corelib_sources.gypi',
@@ skipping 34 matching lines @@
             '../third_party/hamcrest/v1_3/hamcrest-integration-1.3.0RC2.jar',
             '../third_party/hamcrest/v1_3/hamcrest-library-1.3.0RC2.jar',
           ],
           'outputs': [
             '<(INTERMEDIATE_DIR)/<(_target_name)/tests.jar',
             '<(PRODUCT_DIR)/compiler/bin/dartc',
             '<(PRODUCT_DIR)/compiler/lib/args4j/2.0.12/args4j-2.0.12.jar',
             '<(PRODUCT_DIR)/compiler/lib/dartc.jar',
             '<(PRODUCT_DIR)/compiler/lib/guava/r09/guava-r09.jar',
             '<(PRODUCT_DIR)/compiler/lib/json/r2_20080312/json.jar',
-            '<(PRODUCT_DIR)/compiler/lib/rhino/1_7R3/js.jar',
           ],
           'action' : [
             '../third_party/apache_ant/v1_7_1/bin/ant',
             '-f', 'dartc.xml',
             '-Dbuild.dir=<(INTERMEDIATE_DIR)/<(_target_name)',
             '-Ddist.dir=<(PRODUCT_DIR)/compiler',
             'clean',
             'dist',
             'tests.jar',
           ],
@@ skipping 149 matching lines @@
         },
       ],
     },
     {
       # GYP won't generate a catch-all target if there's only one target.
       'target_name': 'dummy',
       'type': 'none',
     },
   ],
 }