Revert of [test] add --no-harness option to debugger tests.

test/debugger/testcfg.py

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import re
 
 from testrunner.local import testsuite
 from testrunner.objects import testcase
 
@@ skipping 33 matching lines @@
     files_match = FILES_PATTERN.search(source);
     # Accept several lines of 'Files:'.
     while True:
       if files_match:
         files_list += files_match.group(1).strip().split()
         files_match = FILES_PATTERN.search(source, files_match.end())
       else:
         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 ])
     if MODULE_PATTERN.search(source):
       files.append("--module")
     files.append(os.path.join(self.root, testcase.path + self.suffix()))
 
     flags += files
     if context.isolates:
       flags.append("--isolate")
       flags += files
 
     return testcase.flags + flags
 
   def GetSourceForTest(self, testcase):
     filename = os.path.join(self.root, testcase.path + self.suffix())
     with open(filename) as f:
       return f.read()
 
 def GetSuite(name, root):
   return DebuggerTestSuite(name, root)