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/ipc_lib/shm_base.h b/aos/ipc_lib/shm_base.h
index 1d06a69..9a56d29 100644
--- a/aos/ipc_lib/shm_base.h
+++ b/aos/ipc_lib/shm_base.h
@@ -3,11 +3,12 @@
 
 #include <string_view>
 
-#include "gflags/gflags.h"
+#include "absl/flags/declare.h"
 
-DECLARE_string(shm_base);
+ABSL_DECLARE_FLAG(std::string, shm_base);
 
 namespace aos::testing {
 void SetShmBase(const std::string_view base);
 }
+
 #endif  // AOS_IPC_LIB_SHM_BASE_H_