[debug] Unskip tests for debug break in builtins.

Win64 MSVC build seems to be fixed.

Bug: v8:178
Change-Id: I6d3ec22511a7a3c25467c486d3d05df0939c7c87
Reviewed-on: https://chromium-review.googlesource.com/970469
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52068}

test/cctest/cctest.status

@@ -240,11 +240,6 @@
 
 ##############################################################################
 ['system == windows', {
-
-  # BUG(178). Fails on windows.
-  'test-debug/BreakPointJSBuiltin': [SKIP],
-  'test-debug/BreakPointConditionBuiltin': [SKIP],
-
   # BUG(v8:4573).
   'test-api/MultipleIsolatesOnIndividualThreads': [PASS, NO_VARIANTS],