Enable no-extra-parens

This enables the no-extra-parens rule.

http://eslint.org/docs/rules/no-extra-parens

Change-Id: I3ae8a4268f01f8493115e065f45c4059ee37f599

.eslintrc

@@ -116,8 +116,8 @@ rules:
   # Disallow extraneous parentheses around functions.
   # http://eslint.org/docs/rules/no-extra-parens
   no-extra-parens:
-    - 0 # TODO(krotscheck): Discuss & Activate
-    - "functions"
+    - 2
+    - "all"
 
   # Disallow extraneous semicolons.
   # http://eslint.org/docs/rules/no-extra-semi