Fix local handle leak in RegExpStringModificationTest.

Review URL: http://codereview.chromium.org/3133027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5308 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-api.cc

@@ -9203,6 +9203,7 @@ class RegExpStringModificationTest {
            morphs_ < kMaxModifications) {
       int morphs_before = morphs_;
       {
+        v8::HandleScope scope;
         // Match 15-30 "a"'s against 14 and a "b".
         const char* c_source =
             "/a?a?a?a?a?a?a?a?a?a?a?a?a?a?aaaaaaaaaaaaaaaa/"