Move over to ABSL logging and flags.

Removes gperftools too since that wants gflags.

Here come the fireworks.

Change-Id: I79cb7bcf60f1047fbfa28bfffc21a0fd692e4b1c
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/events/shm_event_loop.h b/aos/events/shm_event_loop.h
index 5da1632..5de4423 100644
--- a/aos/events/shm_event_loop.h
+++ b/aos/events/shm_event_loop.h
@@ -12,7 +12,7 @@
 #include "aos/ipc_lib/signalfd.h"
 #include "aos/stl_mutex/stl_mutex.h"
 
-DECLARE_string(application_name);
+ABSL_DECLARE_FLAG(std::string, application_name);
 
 namespace aos {
 namespace shm_event_loop_internal {