fixes #415, correct type for map literals

test/codegen/expect/collection/src/unmodifiable_wrappers.txt

Index: test/codegen/expect/collection/src/unmodifiable_wrappers.txt
diff --git a/test/codegen/expect/collection/src/unmodifiable_wrappers.txt b/test/codegen/expect/collection/src/unmodifiable_wrappers.txt
index db710016780ea734b3509cf84ec721b561edbc25..77f0944640314e96cbaa8711c2feb02effc6405f 100644
--- a/test/codegen/expect/collection/src/unmodifiable_wrappers.txt
+++ b/test/codegen/expect/collection/src/unmodifiable_wrappers.txt
@@ -1,6 +1,6 @@
 // Messages from compiling unmodifiable_wrappers.dart
-severe: [AnalyzerMessage] Missing concrete implementation of 'Iterable.map' and 'Iterable.expand' (package:collection/src/unmodifiable_wrappers.dart, line 33, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of 'Iterable.expand' and 'Iterable.map' (package:collection/src/unmodifiable_wrappers.dart, line 136, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of 'Iterable.expand' and 'Iterable.map' (package:collection/src/unmodifiable_wrappers.dart, line 33, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of 'Iterable.map' and 'Iterable.expand' (package:collection/src/unmodifiable_wrappers.dart, line 136, col 7)
 warning: [DOWN_CAST_COMPOSITE] _throw() (dynamic) will need runtime check to cast to type E (package:collection/src/unmodifiable_wrappers.dart, line 88, col 28)
 warning: [DOWN_CAST_COMPOSITE] _throw() (dynamic) will need runtime check to cast to type E (package:collection/src/unmodifiable_wrappers.dart, line 94, col 21)
 warning: [DOWN_CAST_COMPOSITE] _throw() (dynamic) will need runtime check to cast to type V (package:collection/src/unmodifiable_wrappers.dart, line 218, col 41)