Remove ignored type failures

[jmesserly]

From @vsmenon on August 25, 2016 16:49

This was a temporary workaround until generic methods. We should eliminate this:

https://github.com/dart-lang/dev_compiler/blob/master/tool/input_sdk/private/ddc_runtime/operations.dart#L272

Copied from original issue: dart-archive/dev_compiler#630

[jmesserly]

CC @leafpetersen

[vsmenon]

Note, this is currently blocked on lack of typed angular templates. Related to #27255.