chromium/net/data/ssl/certificates/key_usage_p256.key

-----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgeor3507Mmwvc9idK
suXWTudE0GDlVmEc64H7acez5xShRANCAATzrZ6+AHOlorp9D4i4ZEuFW2IcT16D
RCr5q46eSP89CxqRkr4fDMaHCr0GRwtjBrcnuljjBWRtHTAo7u7yqXuT
-----END PRIVATE KEY-----