Roll strong mode fixes in

DEPS

 # 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.
 
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
   # simply sdk, but if using special gclient specs it can be different.
   "dart_root": "sdk",
 
   # We use mirrors of all github repos to guarantee reproducibility and
@@ skipping 19 matching lines @@
   "gyp_rev": "@6ee91ad8659871916f9aa840d42e1513befdf638",
   "co19_rev": "@d4767b4caea3c5828ad8e053cd051d44a59061af",
 
   # Revisions of GN related dependencies.
   "buildtools_revision": "@39b1db2ab4aa4b2ccaa263c29bdf63e7c1ee28aa",
 
   "gperftools_revision": "@02eeed29df112728564a5dde6417fa4622b57a06",
 
   # Revisions of /third_party/* dependencies.
   "args_tag": "@0.13.5",
-  "async_tag": "@1.11.2",
+  "async_tag": "@1.11.3",
   "barback-0.13.0_rev": "@34853",
   "barback-0.14.0_rev": "@36398",
   "barback-0.14.1_rev": "@38525",
   "barback_tag" : "@0.15.2+9",
   "bazel_worker_tag": "@0.1.1",
   "boolean_selector_tag" : "@1.0.2",
   "boringssl_gen_rev": "@62c20247d582444cb2804f9ea4e3abaa6e47f6a5",
   "boringssl_rev" : "@8d343b44bbab829d1a28fdef650ca95f7db4412e",
   "charcode_tag": "@1.1.0",
   "chrome_rev" : "@19997",
   "cli_util_tag" : "@0.0.1+3",
   "code_transformers_tag": "@v0.4.2+3",
   "collection_tag": "@1.10.1",
   "convert_tag": "@2.0.1",
   "crypto_tag" : "@2.0.1",
   "csslib_tag" : "@0.13.2",
   "dart2js_info_tag" : "@0.5.0",
   "dart_services_rev" : "@7aea2574e6f3924bf409a80afb8ad52aa2be4f97",
   "dart_style_tag": "@v0.2.11+1",
   "dartdoc_tag" : "@v0.9.7+6",
   "fixnum_tag": "@0.10.5",
   "func_tag": "@0.1.0",
   "glob_tag": "@1.1.3",
-  "html_tag" : "@0.13.0",
+  "html_tag" : "@0.13.1",
   "http_multi_server_tag" : "@2.0.2",
   "http_parser_tag" : "@3.0.2",
   "http_tag" : "@0.11.3+9",
   "http_throttle_rev" : "@284344cd357e435c6c8ff9a4a21f02b9e384a541",
   "idl_parser_rev": "@7fbe68cab90c38147dee4f48c30ad0d496c17915",
   "initialize_tag": "@v0.6.2+2",
   "intl_tag": "@0.14.0",
   "isolate_tag": "@0.2.3",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@2.0.2",
@@ skipping 22 matching lines @@
   "resource_rev":"@a49101ba2deb29c728acba6fb86000a8f730f4b1",
   "root_certificates_rev": "@aed07942ce98507d2be28cbd29e879525410c7fc",
   "scheduled_test_tag": "@0.12.6",
   "shelf_static_tag": "@0.2.4",
   "shelf_packages_handler_tag": "@1.0.0",
   "shelf_tag": "@0.6.5+3",
   "shelf_web_socket_tag": "@0.2.1",
   "smoke_tag" : "@v0.3.6+2",
   "source_map_stack_trace_tag": "@1.1.3",
   "source_maps-0.9.4_rev": "@38524",
-  "source_maps_tag": "@0.10.1+1",
-  "source_span_tag": "@1.2.3",
+  "source_maps_tag": "@0.10.1+2",
+  "source_span_tag": "@1.2.4",
   "stack_trace_tag": "@1.6.6",
   "stream_channel_tag": "@1.5.0",
   "string_scanner_tag": "@1.0.0",
   "sunflower_rev": "@879b704933413414679396b129f5dfa96f7a0b1e",
   "test_reflective_loader_tag": "@0.1.0",
   "test_tag": "@0.12.15+6",
   "typed_data_tag": "@1.1.3",
   "usage_tag": "@v2.2.2",
   "utf_tag": "@0.9.0+3",
   "watcher_tag": "@0.9.7+3",
   "web_components_rev": "@6349e09f9118dce7ae1b309af5763745e25a9d61",
   "web_socket_channel_tag": "@1.0.4",
   "WebCore_rev": "@a86fe28efadcfc781f836037a80f27e22a5dad17",
   "when_tag": "@0.2.0+2",
   "which_tag": "@0.1.3+1",
-  "yaml_tag": "@2.1.10",
+  "yaml_tag": "@2.1.12",
   "zlib_rev": "@c3d0a6190f2f8c924a05ab6cc97b8f975bddd33f",
 }
 
 deps = {
   # Stuff needed for GYP to run.
   Var("dart_root") + "/third_party/gyp":
       Var('chromium_git') + '/external/gyp.git' + Var("gyp_rev"),
 
   # Stuff needed for GN build.
   Var("dart_root") + "/buildtools":
@@ skipping 430 matching lines @@
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python', 'sdk/build/vs_toolchain.py', 'update'],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/generate_buildfiles.py"],
   },
 ]