Fix Observatory rebuild

runtime/bin/bin.gypi

 # 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.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
 
     'io_cc_file': '<(gen_source_dir)/io_gen.cc',
     'io_patch_cc_file': '<(gen_source_dir)/io_patch_gen.cc',
@@ skipping 480 matching lines @@
       'includes': [
         'resources_sources.gypi',
       ],
       'actions': [
         {
           'action_name': 'generate_resources_cc',
           'inputs': [
             '../tools/create_resources.py',
             # The following two files are used to trigger a rebuild.
             '<(PRODUCT_DIR)/observatory/deployed/web/index.html',
-            '<(PRODUCT_DIR)/observatory/deployed/web/index.html_bootstrap.dart.js',
+            '<(PRODUCT_DIR)/observatory/deployed/web/index.html.polymer.bootstrap.dart.js',
             '<@(_sources)',
           ],
           'outputs': [
             '<(resources_cc_file)',
           ],
           'action': [
             'python',
             'tools/create_resources.py',
             '--output', '<(resources_cc_file)',
             '--outer_namespace', 'dart',
@@ skipping 297 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }