diff --git a/script/lib/config.py b/script/lib/config.py
index 2d1a5d95fdf7e..3db917d172fba 100644
--- a/script/lib/config.py
+++ b/script/lib/config.py
@@ -30,10 +30,6 @@ def get_target_arch():
   return arch
 
 
-def get_env_var(name):
-  return os.environ.get('ELECTRON_' + name, '')
-
-
 def enable_verbose_mode():
   print('Running in verbose mode')
   global verbose_mode
diff --git a/script/lib/native_tests.py b/script/lib/native_tests.py
index 04858bf7ed132..ff3a3a74b2bf2 100644
--- a/script/lib/native_tests.py
+++ b/script/lib/native_tests.py
@@ -121,11 +121,6 @@ def run(self, binaries, output_dir=None, verbosity=Verbosity.CHATTY,
         for binary in binaries])
     return suite_returncode
 
-  def run_only(self, binary_name, output_dir=None, verbosity=Verbosity.CHATTY,
-      disabled_tests_policy=DisabledTestsPolicy.DISABLE):
-    return self.run([binary_name], output_dir, verbosity,
-                    disabled_tests_policy)
-
   def run_all(self, output_dir=None, verbosity=Verbosity.CHATTY,
       disabled_tests_policy=DisabledTestsPolicy.DISABLE):
     return self.run(self.get_for_current_platform(), output_dir, verbosity,
diff --git a/script/lib/util.py b/script/lib/util.py
index abf1310673d80..b33828a2a53d0 100644
--- a/script/lib/util.py
+++ b/script/lib/util.py
@@ -25,12 +25,9 @@ def is_verbose_mode():
 TS_NODE = os.path.join(ELECTRON_DIR, 'node_modules', '.bin', 'ts-node')
 SRC_DIR = os.path.abspath(os.path.join(__file__, '..', '..', '..', '..'))
 
-NPM = 'npm'
 if sys.platform in ['win32', 'cygwin']:
-  NPM += '.cmd'
   TS_NODE += '.cmd'
 
-
 @contextlib.contextmanager
 def scoped_cwd(path):
   cwd = os.getcwd()
@@ -41,18 +38,6 @@ def scoped_cwd(path):
     os.chdir(cwd)
 
 
-@contextlib.contextmanager
-def scoped_env(key, value):
-  origin = ''
-  if key in os.environ:
-    origin = os.environ[key]
-  os.environ[key] = value
-  try:
-    yield
-  finally:
-    os.environ[key] = origin
-
-
 def download(text, url, path):
   safe_mkdir(os.path.dirname(path))
   with open(path, 'wb') as local_file: