Chrome Version: ToT
OS: Mac (Probably, all)

What steps will reproduce the problem?
(1) touch an existing file in third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/
E.g.

diff --git a/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/PRESUBMIT.py b/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/PRESUBMIT.py
index 39bd805..666f956 100644
--- a/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/PRESUBMIT.py
+++ b/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/PRESUBMIT.py
@@ -7,6 +7,7 @@
 
 def _RunTests(input_api, output_api):
     """Runs all test files in the directory."""
+
     cmd_name = 'all_python_tests'
     cmd = ['python', '-m', 'unittest', 'discover', '-p', '*test.py']
     test_cmd = input_api.Command(

(2) Make a local commit for it.
(3) git cl presubmit -u

What is the expected result?
PRESUBMIT.py passes.

What happens instead?
Have the following error:

** Presubmit ERRORS **
all_python_tests (0.26s) failed
E
======================================================================
ERROR: testCanGenerate100Files (fuzz_integration_test.WebBluetoothFuzzerTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/tkent/chrome/src/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/fuzz_integration_test.py", line 21, in setUp
    self._resources_path = setup.RetrieveResources()
  File "/Users/tkent/chrome/src/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/setup.py", line 60, in RetrieveResources
    shutil.copy(os.path.join(current_path, r), resources_path)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 119, in copy
    copyfile(src, dst)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 82, in copyfile
    with open(src, 'rb') as fsrc:
IOError: [Errno 2] No such file or directory: '/Users/tkent/chrome/src/third_party/blink/renderer/modules/bluetooth/testing/clusterfuzz/../../../../../../../third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js'

----------------------------------------------------------------------
Ran 1 test in 0.006s

FAILED (errors=1)
'resources' folder already exists. Clearing it...
Copying: /Users/tkent/chrome/src/third_party/WebKit/LayoutTests/resources/testharness.js
Copying: /Users/tkent/chrome/src/third_party/WebKit/LayoutTests/resources/testharnessreport.js
Copying: /Users/tkent/chrome/src/third_party/WebKit/LayoutTests/resources/bluetooth/bluetooth-helpers.js