Rename ErrorLogUtilCallback to ErrorLogUtilSyncCallback.

Renaming ErrorLogUtilCallback for consistency prior to adding
documentation.

Bug: 344947409
FLAG: TEST_ONLY
BYPASS_PS_FLAG_CHECK: test-only change
Test: presubmit

Change-Id: I463814265a6d11518127dd35d12eb76a98e7e6ff
6 files changed