libbase should use its own logging!

Not doing so led to us using a bogus log tag.

Bug: http://b/30281203
Change-Id: I3ac91758a1a043146c65f2ae0f36fcfbe372c30f
diff --git a/base/logging.cpp b/base/logging.cpp
index 769c266..959bb8b 100644
--- a/base/logging.cpp
+++ b/base/logging.cpp
@@ -43,12 +43,11 @@
 
 #include "android-base/macros.h"
 #include "android-base/strings.h"
-#include "cutils/threads.h"
 
 // Headers for LogMessage::LogLine.
 #ifdef __ANDROID__
 #include <android/set_abort_message.h>
-#include "cutils/log.h"
+#include "log/log.h"
 #else
 #include <sys/types.h>
 #include <unistd.h>