This namespace is not used by this file and its declaration is removed
in a separate CL from utils/Log.h, which is the only place it is
defined, so we must remove this extraneous line.
Also, since that separate CL is deprecating utils/Log.h in favor of
log/log.h, we make the switch to the new header.
Test: Build
Change-Id: Iac4bc8faffbd2d68dc4ccccaf569db0c5a13a7bc