Correct test

As written, the test behavior and description do not match--the
`throw` invocation takes place while generator execution is paused
*within* the `finally` block (not following it).

Ensure that the test exercises the described behavior (and remove
extraneous invocation of method under test).

test/built-ins/GeneratorPrototype/throw/try-finally-following-finally.js

@@ -16,6 +16,7 @@ function* g() {
     yield 3;
   }
   yield 4;
+  $ERROR('This code is unreachable');
 }
 var iter = g();
 var result;
@@ -28,10 +29,14 @@ result = iter.next();
 assert.sameValue(result.value, 2, 'Second result `value`');
 assert.sameValue(result.done, false, 'Second result `done` flag');
 
-result = iter.throw(new Error());
+result = iter.next();
 assert.sameValue(result.value, 3, 'Third result `value`');
 assert.sameValue(result.done, false, 'Third result `done` flag');
 
+result = iter.next();
+assert.sameValue(result.value, 4, 'Third result `value`');
+assert.sameValue(result.done, false, 'Third result `done` flag');
+
 assert.throws(Test262Error, function() { iter.throw(new Test262Error()); });
 
 result = iter.next();