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/fast_string_builder.h b/aos/fast_string_builder.h
index e9a4f27..b27ead1 100644
--- a/aos/fast_string_builder.h
+++ b/aos/fast_string_builder.h
@@ -5,9 +5,10 @@
 #include <string>
 #include <type_traits>
 
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 #include "absl/strings/numbers.h"
 #include "absl/strings/str_format.h"
-#include "glog/logging.h"
 
 namespace aos {