Revert "bootstat: Remove custom uptime parser in favor of elapsedRealtime."

This reverts commit 26f40c04c3ad80e2bc449990010d39d1c1b9a5f0.

This change broke the Darwin SDK target.

Test: none
Change-Id: Ia54fe2c31da8d8fa2825e023b035fb8321dcd457
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);