Move cap_max_workers_in_pool to test/parallel_testsuite.py. NFC (#25196)

This is the only remaining caller.

Author: sbc100

test/parallel_testsuite.py

@@ -16,7 +16,6 @@
 import common
 from common import errlog
 
-from tools.shared import cap_max_workers_in_pool
 from tools.utils import WINDOWS
 
 
@@ -33,6 +32,17 @@ def python_multiprocessing_structures_are_buggy():
   return (v.major, v.minor, v.micro) <= (3, 12, 7) or (v.major, v.minor, v.micro) == (3, 13, 0)
 
 
+def cap_max_workers_in_pool(max_workers, is_browser):
+  if is_browser:
+    # TODO experiment with this number. In browser tests we'll be creating
+    # a chrome instance per worker which is expensive.
+    max_workers = int(max_workers / 2)
+  # Python has an issue that it can only use max 61 cores on Windows: https://github.com/python/cpython/issues/89240
+  if WINDOWS:
+    return min(max_workers, 61)
+  return max_workers
+
+
 def run_test(test, failfast_event, lock, progress_counter, num_tests):
   # If failfast mode is in effect and any of the tests have failed,
   # and then we should abort executing further tests immediately.

tools/shared.py

@@ -128,17 +128,6 @@ def returncode_to_str(code):
   return f'returned {code}'
 
 
-def cap_max_workers_in_pool(max_workers, is_browser):
-  if is_browser:
-    # TODO experiment with this number. In browser tests we'll be creating
-    # a chrome instance per worker which is expensive.
-    max_workers = int(max_workers / 2)
-  # Python has an issue that it can only use max 61 cores on Windows: https://github.com/python/cpython/issues/89240
-  if WINDOWS:
-    return min(max_workers, 61)
-  return max_workers
-
-
 def run_multiple_processes(commands,
                            env=None,
                            route_stdout_to_temp_files_suffix=None,