Revert "Enable presubmit check for copyrighted material in added / modified code"

PRESUBMIT.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
@@ skipping 1788 matching lines @@
         results.append(output_api.PresubmitError(
             'File is stale: %s\nTo regenerate, run:\n\n    %s' %
             (pydep_path, cmd)))
     except input_api.subprocess.CalledProcessError as error:
       return [output_api.PresubmitError('Error running: %s' % error.cmd,
           long_text=error.output)]
 
   return results
 
 
-def _CheckForCopyrightedCode(input_api, output_api):
-  """Verifies that newly added code doesn't contain copyrighted material
-  and is properly licensed under the standard Chromium license.
-
-  As there can be false positives, we maintain a whitelist file. This check
-  also verifies that the whitelist file is up to date.
-  """
-  import sys
-  original_sys_path = sys.path
-  try:
-    sys.path = sys.path + [input_api.os_path.join(
-        input_api.PresubmitLocalPath(), 'tools')]
-    from copyright_scanner import copyright_scanner
-  finally:
-    # Restore sys.path to what it was before.
-    sys.path = original_sys_path
-
-  return copyright_scanner.ScanAtPresubmit(input_api, output_api)
-
-
 def _CheckSingletonInHeaders(input_api, output_api):
   """Checks to make sure no header files have |Singleton<|."""
   def FileFilter(affected_file):
     # It's ok for base/memory/singleton.h to have |Singleton<|.
     black_list = (_EXCLUDED_PATHS +
                   input_api.DEFAULT_BLACK_LIST +
                   (r"^base[\\\/]memory[\\\/]singleton\.h$",))
     return input_api.FilterSourceFile(affected_file, black_list=black_list)
 
   pattern = input_api.re.compile(r'(?<!class\sbase::)Singleton\s*<')
@@ skipping 158 matching lines @@
           output_api,
           source_file_filter=lambda x: x.LocalPath().endswith('.grd')))
   results.extend(_CheckSpamLogging(input_api, output_api))
   results.extend(_CheckForAnonymousVariables(input_api, output_api))
   results.extend(_CheckCygwinShell(input_api, output_api))
   results.extend(_CheckUserActionUpdate(input_api, output_api))
   results.extend(_CheckNoDeprecatedCSS(input_api, output_api))
   results.extend(_CheckNoDeprecatedJS(input_api, output_api))
   results.extend(_CheckParseErrors(input_api, output_api))
   results.extend(_CheckForIPCRules(input_api, output_api))
-  results.extend(_CheckForCopyrightedCode(input_api, output_api))
   results.extend(_CheckForWindowsLineEndings(input_api, output_api))
   results.extend(_CheckSingletonInHeaders(input_api, output_api))
   results.extend(_CheckNoDeprecatedCompiledResourcesGYP(input_api, output_api))
   results.extend(_CheckPydepsNeedsUpdating(input_api, output_api))
   results.extend(_CheckJavaStyle(input_api, output_api))
   results.extend(_CheckIpcOwners(input_api, output_api))
   results.extend(_CheckMojoUsesNewWrapperTypes(input_api, output_api))
 
   if any('PRESUBMIT.py' == f.LocalPath() for f in input_api.AffectedFiles()):
     results.extend(input_api.canned_checks.RunUnitTestsInDirectory(
@@ skipping 267 matching lines @@
   results.extend(input_api.canned_checks.CheckTreeIsOpen(
       input_api,
       output_api,
       json_url='http://chromium-status.appspot.com/current?format=json'))
 
   results.extend(input_api.canned_checks.CheckChangeHasBugField(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasDescription(
       input_api, output_api))
   return results