Don't fuzz _GeneratorNext

The previous patch that renamed _GeneratorSend to _GeneratorNext missed
the blacklist in fuzz-natives-part4.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16339008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15035 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/fuzz-natives-part4.js

@@ -202,7 +202,7 @@ var knownProblems = {
   "_TwoByteSeqStringSetChar": true,
 
   // Only applicable to generators.
-  "_GeneratorSend": true,
+  "_GeneratorNext": true,
   "_GeneratorThrow": true
 };