Unskip debugger tests after GC fix.

This has been fixed by 165186f2.

R=machenbach@chromium.org
BUG=v8:4893,v8:4894
LOG=N

Review URL: https://codereview.chromium.org/1882923006

Cr-Commit-Position: refs/heads/master@{#35515}

test/mjsunit/mjsunit.status

@@ -284,9 +284,6 @@
   'harmony/unicode-regexp-ignore-case-noi18n': [FAIL, ['no_i18n == True', PASS]],
   # desugaring regexp property class relies on ICU.
   'harmony/regexp-property-*': [PASS, ['no_i18n == True', FAIL]],
-
-  # BUG(v8:4894).
-  'es6/debug-step-into-constructor': [PASS, ['system == linux and arch == x64 and mode == release ', FAST_VARIANTS]],
 }],  # ALWAYS
 
 ['novfp3 == True', {
@@ -651,9 +648,6 @@
 
   # BUG(v8:4495).
   'es6/collections': [PASS, ['arch == ia32', FAST_VARIANTS]],
-
-  # BUG(v8:4893).
-  'regress/regress-crbug-506443': [PASS, ['no_snap', FAST_VARIANTS]],
 }],  # 'system == windows'
 
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