Bump DEPS to 0.1.5.

Pulls in:

* Added `prefer_is_not_empty` lint rule (#143).
* Added `type_annotate_public_apis` lint rule (#24).
* Added `avoid_as` lint rule (#145).
* Fixed `non_constant_identifier_names` rule to special case underscore identifiers in callbacks.
* Fix to escape `_`s in callback type validation (addresses false positives in `always_specify_types`) (#147).

R=keertip@google.com

Review URL: https://codereview.chromium.org/1434773002 .

DEPS

@@ -68,7 +68,7 @@ vars = {
   "intl_rev": "@32047558bd220a53c1f4d93a26d54b83533b1475",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@1.1.1",
-  "linter_rev": "@8e17ff78dec57117910b32bbd837cbc3237f7d99",
+  "linter_rev": "@0f27426969cdd9dad88f68021d2fd5edf786df9c",
   "logging_rev": "@85d83e002670545e9039ad3985f0018ab640e597",
   "markdown_rev": "@4aaadf3d940bb172e1f6285af4d2b1710d309982",
   "matcher_tag": "@0.12.0",