Update 1.17 engine hash to Dart 2.8.0-20.11.beta (#17740)

Patrick Sosinski · web-flow · commit f0c695b5110e · 2020-04-20T12:52:38.000-07:00
* Update 1.17 engine hash to Dart 2.8.0-dev.20.8

* Update license file

* Update Flutter 1.17 to use Dart 2.8.0-20.11.beta

* Update license
diff --git a/DEPS b/DEPS
@@ -34,7 +34,7 @@ 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': 'eea97179386a9ced7d68452cea158345f4019baa',
+  'dart_revision': '4a07fd313fb946560e51331110df681ebb48f148',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 2e30af9ab4d1fe33bdb65dccaa867377
+Signature: a402199d93abdb49de2dc2d35de88a08
 
 UNUSED LICENSES:
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-Signature: 2e30af9ab4d1fe33bdb65dccaa867377`
	`1`	`+Signature: a402199d93abdb49de2dc2d35de88a08`
`2`	`2`
`3`	`3`	`UNUSED LICENSES:`
`4`	`4`