Revert "bootstat: Refactor init/utils/boot_clock into base/chrono_utils."

This reverts commit 7c92e484503f239000ef97ef5b067907fbeaa4a6.

Mac sdk still broken (despite testing locally).

Change-Id: I7d9206e15997cd0efe081bd3fa17d53d2b20ec32
diff --git a/init/init.cpp b/init/init.cpp
index 4af0656..43f601f 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -40,7 +40,6 @@
 #include <selinux/label.h>
 #include <selinux/android.h>
 
-#include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
@@ -69,7 +68,6 @@
 #include "util.h"
 #include "watchdogd.h"
 
-using android::base::boot_clock;
 using android::base::StringPrintf;
 
 struct selabel_handle *sehandle;
@@ -752,7 +750,7 @@
         return watchdogd_main(argc, argv);
     }
 
-    boot_clock::time_point start_time = android::base::boot_clock::now();
+    boot_clock::time_point start_time = boot_clock::now();
 
     // Clear the umask.
     umask(0);