Roll to pickup pool changes

packages/crypto/lib/src/hash_sink.dart

Index: packages/crypto/lib/src/hash_sink.dart
diff --git a/packages/crypto/lib/src/hash_sink.dart b/packages/crypto/lib/src/hash_sink.dart
index 369d3e3e970b60ef85a0abc5adeac2adc8feabe2..ef38780458f5a28943ced8b629f999a0ae8d2e2e 100644
--- a/packages/crypto/lib/src/hash_sink.dart
+++ b/packages/crypto/lib/src/hash_sink.dart
@@ -127,7 +127,7 @@ abstract class HashSink implements Sink<List<int>> {
 
     if (_lengthInBytes > _maxMessageLengthInBytes) {
       throw new UnsupportedError(
-          "Hashing is unsupported for messages with more than 2^64 bits.");
+          'Hashing is unsupported for messages with more than 2^64 bits.');
     }
 
     var lengthInBits = _lengthInBytes * bitsPerByte;