Roll dart to cd0c4e4. (flutter#5113)

* Roll dart to cd0c4e4.

Changes since last roll:

```
cd0c4e4 Kernel service just returns errors. Leaves printing to the VM.
010d814 Add missing copyright notice
70547d8 Change linter subscriptions from functions to AstVisitor(s).
88a098c Improve fasta parser field name recovery
bd76221 fix flutter#31489, JS interop to `prototype` getter in dartdevk
ca419a9 dart2js status refresh
da49615 Don't filter out references to constructors.
cc968df [test] Fix analyzer warning in the recently added test
1c5d1a5 Clean up some hints
5a9a479 Fix flutter#32966 too little stack overflow context to be useful
2786b9f [vm/aot] Add detailed error messages and stack traces for null checks
fbfe569 Change completionTarget.forOffset to accept & wrap dangling AstNodes.
cb15b43 Add support for getting parse results synchronously
e0ddab3 Fix bots after preview-dart2 was switched on by default.
88099ff Stop importing front_end into analyzer_plugin.
115850c Revert "Clean up the use of deprecated API in the analyzer_plugin package"
f95df2a [dartfmt] Bump dart:style to 1.0.11
c97d36c Add all concrete AST nodes for lints to subscribe.
1afe71c Enable preview-dart-2 as default for analyzer.
45e3900 [kernel] Report error for dangling node reference in metadata
c1c9035 Record a missing file offset
16be5d1 [VM] Fix missing update of off-heap class sizes
c8ad75d [VM] Make classes movable in sliding compactor
c59b390 Update status
93511d5 Track RTI for noSuchMethod
f6db874 fix some dartdevk behavior to match dartdevc in more cases
c0015fe [gardening] Skip tests that are meaningless in AOT configuration.
9f7a247 Remove dangling pubspec.lock from pkg/dev_compiler/test/
004ee9c Fix how we use Comparable.compare, so we have a function with the appropriate type in JSArray.sort
30b53ce fix flutter#30852, cyclic init errors in some cases in dartdevc
94f45c8 Bring in the latest pub
328163b [kernel] CloneVisitor should preserve isDefault on switch cases.
613c6d0 [vm][windows] Implement VirtualMemory::FreeSubSegment
7c6594c fix flutter#32302, friendlier `Type.toString()` in dartdevc
e7848a8 [vm/kernel] Avoid dangling references to DartTypes from constant pool
d47203a Fix a crash in type inference
1030189 Add NodeLintRule and UnitLintRule that replace AstVisitor in lints.
9e9b50d Improve error messages for annotations involving undefined names (issue 27788)
d7ff30c Add a missing call to greatestClosure
c844011 Don't skip pkg/kernel/test/metadata_test
```

* Update license hash. No changes to the licenses.

DEPS

@@ -31,7 +31,7 @@ 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': '8d4074175fb95cd4da810b4bf652a956449bac37',
+  'dart_revision': 'cd0c4e4fe1e5b69ac15c0a670f9dde2ee9733fc7',
 
   'dart_args_tag': '1.4.1',
   'dart_async_tag': '2.0.6',
@@ -47,7 +47,7 @@ vars = {
   'dart_crypto_tag': '2.0.2+1',
   'dart_csslib_tag': '0.14.1',
   'dart_dart2js_info_tag': '0.5.6+2',
-  'dart_dart_style_tag': '1.0.10',
+  'dart_dart_style_tag': '1.0.11',
   'dart_dartdoc_tag': 'v0.18.1',
   'dart_fixnum_tag': '0.10.5',
   'dart_glob_tag': '1.1.5',
@@ -74,7 +74,7 @@ vars = {
   'dart_plugin_tag': '0.2.0+2',
   'dart_pool_tag': '1.3.4',
   'dart_protobuf_tag': '0.7.1',
-  'dart_pub_rev': '4947e0b3cb3ec77e4e8fe0d3141ce4dc60f43256',
+  'dart_pub_rev': '2e821bff00c00889afe5200e3a33f280ce942336',
   'dart_pub_semver_tag': '1.3.7',
   'dart_quiver_tag': '5aaa3f58c48608af5b027444d561270b53f15dbf',
   'dart_resource_rev': 'af5a5bf65511943398146cf146e466e5f0b95cb9',

travis/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 5433171f523e5dae35d19cc125a1f099
+Signature: 73c6433a75e1b3fcb7afbe95d40895a4
 
 UNUSED LICENSES: