Start working on version 1.21

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index da4429bba6037e7a04e091bf8b67283896501046..9cbb00941c10a935d50bcf1a9ccea6c1add7b25a 100644
--- a/DEPS
+++ b/DEPS
@@ -37,7 +37,7 @@ vars = {
 
   # Revisions of /third_party/* dependencies.
   "args_tag": "@0.13.5",
-  "async_tag": "@1.11.1",
+  "async_tag": "@1.11.2",
   "barback-0.13.0_rev": "@34853",
   "barback-0.14.0_rev": "@36398",
   "barback-0.14.1_rev": "@38525",
@@ -54,10 +54,10 @@ vars = {
   "convert_tag": "@2.0.1",
   "crypto_tag" : "@2.0.1",
   "csslib_tag" : "@0.13.2",
-  "dart2js_info_tag" : "@0.2.7+1",
+  "dart2js_info_tag" : "@0.2.7+2",
   "dart_services_rev" : "@7aea2574e6f3924bf409a80afb8ad52aa2be4f97",
   "dart_style_tag": "@0.2.10",
-  "dartdoc_tag" : "@v0.9.7+3",
+  "dartdoc_tag" : "@v0.9.7+4",
   "fixnum_tag": "@0.10.5",
   "func_tag": "@0.1.0",
   "glob_tag": "@1.1.3",
@@ -68,14 +68,14 @@ vars = {
   "http_throttle_rev" : "@284344cd357e435c6c8ff9a4a21f02b9e384a541",
   "idl_parser_rev": "@7fbe68cab90c38147dee4f48c30ad0d496c17915",
   "initialize_tag": "@v0.6.2+2",
-  "intl_tag": "@0.13.1",
+  "intl_tag": "@0.14.0",
   "isolate_tag": "@0.2.3",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@2.0.2",
   "kernel_rev": "@449803b82e850a41148e636db1a6e4a848284aed",
   "linter_tag": "@0.1.27",
   "logging_tag": "@0.11.3+1",
-  "markdown_rev": "@4aaadf3d940bb172e1f6285af4d2b1710d309982",
+  "markdown_tag": "@0.11.0",
   "matcher_tag": "@0.12.0+2",
   "metatest_tag": "@0.2.2+2",
   "mime_rev": "@75890811d4af5af080351ba8a2853ad4c8df98dd",
@@ -239,7 +239,7 @@ deps = {
   Var("dart_root") + "/third_party/pkg/logging":
       (Var("github_mirror") % "logging") + Var("logging_tag"),
   Var("dart_root") + "/third_party/pkg/markdown":
-      (Var("github_mirror") % "markdown") + Var("markdown_rev"),
+      (Var("github_mirror") % "markdown") + Var("markdown_tag"),
   Var("dart_root") + "/third_party/pkg/matcher":
       (Var("github_mirror") % "matcher") + Var("matcher_tag"),
   Var("dart_root") + "/third_party/pkg/metatest":
@@ -496,20 +496,6 @@ hooks = [
     ],
   },
   {
-    "name": "petitparser",
-    "pattern": ".",
-    "action": [
-      "download_from_google_storage",
-      "--no_auth",
-      "--no_resume",
-      "--bucket",
-      "dart-dependencies",
-      "--extract",
-      "-s",
-      Var('dart_root') + "/third_party/pkg/petitparser.tar.gz.sha1",
-    ],
-  },
-  {
     "name": "unittest",
     # Unittest is an early version, 0.11.6, of the package "test"
     # Do not use it in any new tests.