Revert "Roll dart to pick up change where platform.dill was removed (#4180)" (#4185)

This reverts commit 37f571ee09b24f0248e3ab5d530acdb8ec2db018.
diff --git a/DEPS b/DEPS
index 258ff1b..a8f5639 100644
--- a/DEPS
+++ b/DEPS
@@ -31,7 +31,7 @@
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '90587a6837c5ad4a64d571397a8ba65a7cc3f44f',
+  'dart_revision': '9ee73fe322ce3875a6b1f16ba16d64b11c680e90',
 
   'dart_args_tag': '0.13.7',
   'dart_async_tag': '2.0.0',
@@ -48,7 +48,7 @@
   'dart_csslib_tag': '0.14.1',
   'dart_dart2js_info_tag': '0.5.5+1',
   'dart_dart_style_tag': '1.0.7',
-  'dart_dartdoc_tag': 'v0.14.1',
+  'dart_dartdoc_tag': 'v0.13.0+3',
   'dart_fixnum_tag': '0.10.5',
   'dart_glob_tag': '1.1.5',
   'dart_html_tag': '0.13.2',
diff --git a/lib/snapshot/BUILD.gn b/lib/snapshot/BUILD.gn
index 48ff46a..f67ac2d 100644
--- a/lib/snapshot/BUILD.gn
+++ b/lib/snapshot/BUILD.gn
@@ -322,12 +322,9 @@
   # libraries.
   generate_patched_sdk(target_name) {
     mode = "flutter"
-    deps = concatenation_target_names + ["//dart/runtime/vm:kernel_platform_files"]
+    deps = concatenation_target_names + ["//dart/runtime/vm:patched_sdk"]
     input_patches_dir = "$target_gen_dir/patches"
     patched_sdk_dir = "flutter_patched_sdk"
-    outputs = [
-        "$root_out_dir/${patched_sdk_dir}/lib/libraries.json",
-    ]
   }
 }
 
@@ -390,36 +387,3 @@
     ],
   ]
 }
-
-action("compile_platform") {
-  script = "//dart/tools/compile_platform.py"
-
-  sources = [
-    "$root_out_dir/flutter_patched_sdk/lib/libraries.json",
-  ]
-
-  outputs = [
-    "$root_out_dir/flutter_patched_sdk/platform.dill",
-    "$root_out_dir/flutter_patched_sdk/vm_outline.dill",
-  ]
-
-  inputs = []
-
-  deps = [
-    ":flutter_patched_sdk",
-  ]
-
-  depfile = "$root_out_dir/flutter_patched_sdk/platform.dill.d"
-
-  args = [
-            "--target=flutter",
-            "dart:core"
-         ] + rebase_path(sources, root_build_dir) +
-         rebase_path(outputs, root_build_dir)
-}
-
-group("kernel_platform_files") {
-  public_deps = [
-    ":compile_platform",
-  ]
-}
diff --git a/travis/licenses_golden/licenses_dart b/travis/licenses_golden/licenses_dart
index 7411fb9..c18078b 100644
--- a/travis/licenses_golden/licenses_dart
+++ b/travis/licenses_golden/licenses_dart
@@ -1,4 +1,4 @@
-Signature: ec2f9d17b9193fc1d549c977d8f8cc81
+Signature: cda91405b88ecd9ce6b78876552348c6
 
 UNUSED LICENSES: