Converted Observatory heap-map element

runtime/observatory/observatory_sources.gypi

 # Copyright (c) 2016, 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.
 
 # This file contains all dart, css, and html sources for Observatory.
 {
   'sources': [
     'lib/allocation_profile.dart',
     'lib/app.dart',
     'lib/cli.dart',
@@ skipping 61 matching lines @@
     'lib/src/elements/field_ref_wrapper.dart',
     'lib/src/elements/field_view.dart',
     'lib/src/elements/field_view.html',
     'lib/src/elements/flag_list.dart',
     'lib/src/elements/function_ref.dart',
     'lib/src/elements/function_ref_wrapper.dart',
     'lib/src/elements/function_view.dart',
     'lib/src/elements/function_view.html',
     'lib/src/elements/general_error.dart',
     'lib/src/elements/heap_map.dart',
-    'lib/src/elements/heap_map.html',
     'lib/src/elements/heap_snapshot.dart',
     'lib/src/elements/helpers/any_ref.dart',
     'lib/src/elements/helpers/rendering_queue.dart',
     'lib/src/elements/helpers/rendering_scheduler.dart',
     'lib/src/elements/helpers/tag.dart',
     'lib/src/elements/helpers/uris.dart',
     'lib/src/elements/icdata_ref.dart',
     'lib/src/elements/icdata_view.dart',
     'lib/src/elements/img/chromium_icon.png',
     'lib/src/elements/img/dart_icon.png',
@@ skipping 178 matching lines @@
     'lib/utils.dart',
     'web/favicon.ico',
     'web/index.html',
     'web/main.dart',
     'web/third_party/trace_viewer_full.html',
     'web/timeline.html',
     'web/timeline.js',
     'web/timeline_message_handler.js',
   ]
 }