Revert of [test] add --no-harness option to debugger tests. (patchset #1 id:1...

Revert of [test] add --no-harness option to debugger tests. (patchset #1 id:1 of https://codereview.chromium.org/2831083003/ )

Reason for revert:
Should define its own NO_HARNESS_PATTERN. See comments.

Original issue's description:
> [test] add --no-harness option to debugger tests.
>
> Review-Url: https://codereview.chromium.org/2831083003
> Cr-Commit-Position: refs/heads/master@{#44774}
> Committed: https://chromium.googlesource.com/v8/v8/+/43c20d4cc566c68ce0b566cad0ac6fa92bba8eff

TBR=caitp@igalia.com,yangguo@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/2871593002
Cr-Commit-Position: refs/heads/master@{#45163}

test/debugger/testcfg.py

@@ -51,8 +51,7 @@ class DebuggerTestSuite(testsuite.TestSuite):
         break
 
     files = []
-    if not context.no_harness and not NO_HARNESS_PATTERN.search(source):
-      files.append(os.path.normpath(os.path.join(self.root, "..", "mjsunit", "mjsunit.js")))
+    files.append(os.path.normpath(os.path.join(self.root, "..", "mjsunit", "mjsunit.js")))
     files.append(os.path.join(self.root, "test-api.js"))
     files.extend([ os.path.normpath(os.path.join(self.root, '..', '..', f))
                   for f in files_list ])