Use one declaration per statement

The old style of merging all of a function's variable declarations into
a single statement made some sense back in the days of var, but there's
no reason to keep doing it now that we use const and let.

spec/core/asymmetric_equality/AnySpec.js

@@ -54,8 +54,8 @@ describe('Any', function() {
   });
 
   it('matches another constructed object', function() {
-    const Thing = function() {},
-      any = new privateUnderTest.Any(Thing);
+    const Thing = function() {};
+    const any = new privateUnderTest.Any(Thing);
 
     expect(any.asymmetricMatch(new Thing())).toBe(true);
   });