Reduce strong mode errors and warnings

pkg/front_end/lib/src/fasta/scanner/recover.dart

Index: pkg/front_end/lib/src/fasta/scanner/recover.dart
diff --git a/pkg/front_end/lib/src/fasta/scanner/recover.dart b/pkg/front_end/lib/src/fasta/scanner/recover.dart
index 1479be9c8f946ef9155fbe93609f36f99e24a662..b1dd4d0fcefd3f3dfa05976567e19817ff14e667 100644
--- a/pkg/front_end/lib/src/fasta/scanner/recover.dart
+++ b/pkg/front_end/lib/src/fasta/scanner/recover.dart
@@ -54,7 +54,7 @@ Token defaultRecoveryStrategy(
   Token beforeGoodTail;
 
   recoverIdentifier(NonAsciiIdentifierToken first) {
-    List codeUnits = <int>[];
+    var codeUnits = <int>[];

[ahe, 2017/02/07 11:03:08]

Restore type.

[Siggi Cherem (dart-lang), 2017/02/07 21:59:26]

Done.

Not sure if you know: in strong mode `var` gets inferred with the type of the
rhs, in this case List<int>, so it was treated as such below whether I include
the type or var.

Just to double check: do you prefer the type to be explicit in this case? Or
would you be OK omitting it given that we know it is inferred?

[ahe, 2017/02/08 19:59:24]

Thank you. I prefer for types to be explicit as I can't see the inferred type in
Emacs and code reviews.

 
     // True if the previous good token is an identifier and ends right where
     // [first] starts. This is the case for input like `blåbærgrød`. In this