Roll Dart SDK from 1e3e5efcd47e to 6397e8b91103 (18 revisions) (flutter/engine#25861)

DEPS

@@ -35,7 +35,7 @@ vars = {
   # 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': '1e3e5efcd47edeb7ae5a69e146c8ea0559305a98',
+  'dart_revision': '6397e8b9110327b777935b1e8c3e921dbbd5fa31',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -45,7 +45,7 @@ vars = {
   'dart_collection_rev': '9967dcd3d7645db6de48d5abfab3018bb0c84236',
   'dart_http_throttle_tag': '1.0.2',
   'dart_intl_tag': '0.17.0-nullsafety',
-  'dart_linter_tag': '1.3.0',
+  'dart_linter_tag': '1.4.0',
   'dart_protobuf_rev': '0d03fd588df69e9863e2a2efc0059dee8f18d5b2',
   'dart_pub_rev': '0e657414a472e74ca5dd76ae0db50cc060251dec',
   'dart_resource_rev': '6b79867d0becf5395e5819a75720963b8298e9a7',
@@ -154,7 +154,7 @@ deps = {
    Var('dart_git') + '/args.git@d8fea36c10ef96797be02e3d132d572445cd86f4',
 
   'src/third_party/dart/third_party/pkg/async':
-   Var('dart_git') + '/async.git@376c0fe95fa6fe7a5a6c41ef7b4585085c826f89',
+   Var('dart_git') + '/async.git@cde00b89bd3c19e877b21de2c02282d4d311d0a5',
 
   'src/third_party/dart/third_party/pkg/bazel_worker':
    Var('dart_git') + '/bazel_worker.git@0885637b037979afbf5bcd05fd748b309fd669c0',
@@ -205,7 +205,7 @@ deps = {
    Var('dart_git') + '/html.git@00cd3c22dac0e68e6ed9e7e4945101aedb1b3109',
 
   'src/third_party/dart/third_party/pkg/http':
-   Var('dart_git') + '/http.git@69d6064dd92470ed7ccd50a808fc789ee7716fe8',
+   Var('dart_git') + '/http.git@14e4fece54591436c1e3083df350b8e142067ae7',
 
   'src/third_party/dart/third_party/pkg/http_multi_server':
    Var('dart_git') + '/http_multi_server.git@7aca9e87d4a68374b685334f20359320054b8d7b',
@@ -307,7 +307,7 @@ deps = {
    Var('dart_git') + '/term_glyph.git@6a0f9b6fb645ba75e7a00a4e20072678327a0347',
 
   'src/third_party/dart/third_party/pkg/test':
-   Var('dart_git') + '/test.git@e673623f45d75ccec750d35271b0b4d1423e9fac',
+   Var('dart_git') + '/test.git@433f1d8726f9c1484007588470b17830a5e97a12',
 
   'src/third_party/dart/third_party/pkg/test_reflective_loader':
    Var('dart_git') + '/test_reflective_loader.git@54e930a11c372683792e22bddad79197728c91ce',