Use absolute namespace references in //base/logging.h macros

Macros can be used in various namespace contexts, and macros that expand
to "logging::Something" can end up choosing some_namespace::logging
if used in a context wher ethere exists a nested namespace logging with
a conflicting name like LogMessage. It's fixable by using "::logging::"
instead of "logging::" in the macros.

No examples of such issues in chrome, but this can help downstream and
seems a good thing to do consistently.

BUG=

Review-Url: https://codereview.chromium.org/2045203004
Cr-Commit-Position: refs/heads/master@{#406910}
1 file changed