[debugger] re-enable step in frame test.

Issue has long been fixed.

R=jkummerow@chromium.org
BUG=v8:2921
LOG=N

Review URL: https://codereview.chromium.org/1518403004

Cr-Commit-Position: refs/heads/master@{#32862}

test/mjsunit/debug-step-4-in-frame.js

@@ -113,20 +113,20 @@ TestCase(undefined, 0, "0,0,-1");
 TestCase(undefined, 1, "0,0,-1");
 TestCase(undefined, 2, "0,0,0");
 TestCase(undefined, 5, "0,0,1");
-TestCase(undefined, 8, "0,0,3");
+TestCase(undefined, 8, "0,0,2");
 
 // Stepping in the frame #0 (should be exactly the same as above).
 TestCase(0, 0, "0,0,-1");
 TestCase(0, 1, "0,0,-1");
 TestCase(0, 2, "0,0,0");
 TestCase(0, 5, "0,0,1");
-TestCase(0, 8, "0,0,3");
+TestCase(0, 8, "0,0,2");
 
 // Stepping in the frame #1.
 TestCase(1, 0, "0,0,3");
 TestCase(1, 3, "0,1,3");
-TestCase(1, 7, "0,3,3");
+TestCase(1, 7, "0,2,3");
 
 // Stepping in the frame #2.
 TestCase(2, 3, "1,3,3");
-TestCase(2, 7, "3,3,3");
+TestCase(2, 7, "2,3,3");

test/mjsunit/mjsunit.status

@@ -30,11 +30,6 @@
   # All tests in the bug directory are expected to fail.
   'bugs/*': [FAIL],
 
-  ##############################################################################
-  # Flaky tests.
-  # BUG(v8:2921).
-  'debug-step-4-in-frame': [PASS, FAIL, SLOW],
-
   ##############################################################################
   # Fails.
   'regress/regress-1119': [FAIL],