Auto merge of #27007 - saschanaz:py3-flake, r=jdm

Upgrade flake8/pyflakes for Py3 compatibility

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---
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- [ ] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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tests/wpt/grouping_formatter.py

@@ -75,8 +75,8 @@ class ServoFormatter(base.BaseFormatter):
     def text_to_erase_display(self):
         if not self.interactive or not self.current_display:
             return ""
-        return ((self.move_up + self.clear_eol) *
-                self.current_display.count('\n'))
+        return ((self.move_up + self.clear_eol)
+                * self.current_display.count('\n'))
 
     def generate_output(self, text=None, new_display=None, unexpected_in_test=None):
         if not self.interactive:

tests/wpt/run.py

@@ -19,6 +19,7 @@ def wpt_path(*args):
 def servo_path(*args):
     return os.path.join(servo_root, *args)
 
+
 paths = {"include_manifest": wpt_path("include.ini"),
          "config": wpt_path("config.ini"),
          "ca-cert-path": wpt_path("web-platform-tests/tools/certs/cacert.pem"),
@@ -26,8 +27,8 @@ paths = {"include_manifest": wpt_path("include.ini"),
          "host-cert-path": wpt_path("web-platform-tests/tools/certs/web-platform.test.pem")}
 # Imports
 sys.path.append(wpt_path("web-platform-tests", "tools"))
-import localpaths  # noqa: flake8
-from wptrunner import wptrunner, wptcommandline
+import localpaths  # noqa: F401,E402
+from wptrunner import wptrunner, wptcommandline  # noqa: E402
 
 
 def run_tests(**kwargs):
@@ -106,5 +107,6 @@ def main():
     kwargs = vars(parser.parse_args())
     return run_tests(**kwargs)
 
+
 if __name__ == "__main__":
     sys.exit(0 if main() else 1)

tests/wpt/update.py

@@ -5,6 +5,7 @@
 import os
 import sys
 from wptrunner import wptcommandline
+from update import updatecommandline
 
 here = os.path.split(__file__)[0]
 
@@ -12,9 +13,6 @@ here = os.path.split(__file__)[0]
 def wpt_path(*args):
     return os.path.join(here, *args)
 
-# Imports
-from update import updatecommandline
-
 
 def update_tests(**kwargs):
     import update
@@ -45,5 +43,6 @@ def main():
     kwargs = vars(parser.parse_args())
     return update_tests(**kwargs)
 
+
 if __name__ == "__main__":
     sys.exit(0 if main() else 1)