Roll Dart dependency (#3778)

* Roll Dart dependency

* Update license file

DEPS

@@ -28,7 +28,7 @@ vars = {
   # dependencies of Dart are also updated to match the entries in the
   # Dart SDK's DEPS file for that revision of Dart. The DEPS file for
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS
-  'dart_revision': 'd86cb763b982ae3a3ace96eea7acbd7aa53fae0d',
+  'dart_revision': '65a5707189dec6c5e0174cbc821acfb90f0c9b3f',
   # Dart calls the next one "boringssl_gen_rev"
   'dart_boringssl_gen_revision': '753224969dbe43dad29343146529727b5066c0f3',
   # Dart calls the next one "boringssl_rev"

travis/licenses_golden/licenses_dart

-Signature: 657c3d706e3adb5b15dd38a37cd0e2b8
+Signature: bcf5ed029d6812d104040b05727b5425
 
 UNUSED LICENSES:
 
@@ -1226,6 +1226,7 @@ FILE: ../../../dart/client/idea/.idea/.name
 FILE: ../../../dart/client/idea/.idea/inspectionProfiles/Project_Default.xml
 FILE: ../../../dart/client/idea/.idea/vcs.xml
 FILE: ../../../dart/runtime/CPPLINT.cfg
+FILE: ../../../dart/runtime/bin/vmservice_sdk/lib/libraries.json
 FILE: ../../../dart/runtime/bin/vmserviceio_dartium.dart
 FILE: ../../../dart/runtime/observatory/.analysis_options
 FILE: ../../../dart/runtime/observatory/.packages