CL: https://codereview.chromium.org/1675143004/

All win trybots failed with purple code.
P1 as this is making trybots useless.

@@@STEP_LOG_LINE@exception@Traceback (most recent call last):@@@
@@@STEP_LOG_LINE@exception@  File "E:\b\build\scripts\slave\.recipe_deps\recipe_engine\recipe_engine\step_runner.py", line 160, in run@@@
@@@STEP_LOG_LINE@exception@    cmd=cmd, handles=handles, env=step_env, cwd=step_dict.get('cwd'))@@@
@@@STEP_LOG_LINE@exception@  File "E:\b\build\scripts\slave\.recipe_deps\recipe_engine\recipe_engine\step_runner.py", line 287, in _run_cmd@@@
@@@STEP_LOG_LINE@exception@    **fhandles)@@@
@@@STEP_LOG_LINE@exception@  File "E:\b\depot_tools\python276_bin\lib\subprocess.py", line 709, in __init__@@@
@@@STEP_LOG_LINE@exception@    errread, errwrite)@@@
@@@STEP_LOG_LINE@exception@  File "E:\b\depot_tools\python276_bin\lib\subprocess.py", line 957, in _execute_child@@@
@@@STEP_LOG_LINE@exception@    startupinfo)@@@
@@@STEP_LOG_LINE@exception@WindowsError: [Error 2] The system cannot find the file specified@@@
@@@STEP_LOG_END@exception@@@
@@@STEP_EXCEPTION@@@