Fix for DeclarationResolver.

Fix for DeclarationResolver.

It's not the main problem we observe during pkg/analysis_server/test/operation/operation_test, but I still saw it.

The actual fix is removing "unary-".

The other change is just for performance.
It is much cheaper to compare int(s) than to compute (for methods) 'displayName'.
Maybe we should go as far as removing the name check altogether and use just element kind.

R=brianwilkerson@google.com
BUG=

Committed: https://github.com/dart-lang/sdk/commit/a9632f3babf0b623264342ea9edd2c870af21a16

[Brian Wilkerson, 2015-06-04 02:51:57]

LGTM, but I don't understand why we didn't run into this problem until moving to
the new task model.

[scheglov, 2015-06-04 02:59:55]

On 2015/06/04 02:51:57, Brian Wilkerson wrote:
> LGTM, but I don't understand why we didn't run into this problem until moving
to
> the new task model.

AFAIK we don't actually use ResolveDartUnitTask anywhere else.

[scheglov, 2015-06-04 17:41:23]

Committed patchset #1 (id:1) manually as
a9632f3babf0b623264342ea9edd2c870af21a16 (presubmit successful).