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/base/Android.bp b/base/Android.bp
index 515b063..b9a6e0b 100644
--- a/base/Android.bp
+++ b/base/Android.bp
@@ -42,31 +42,21 @@
             srcs: [
                 "errors_unix.cpp",
                 "properties.cpp",
-                "chrono_utils.cpp",
             ],
             cppflags: ["-Wexit-time-destructors"],
         },
         darwin: {
-            srcs: [
-                "errors_unix.cpp",
-            ],
+            srcs: ["errors_unix.cpp"],
             cppflags: ["-Wexit-time-destructors"],
         },
         linux_bionic: {
-            srcs: [
-                "chrono_utils.cpp",
-                "errors_unix.cpp",
-            ],
+            srcs: ["errors_unix.cpp"],
             cppflags: ["-Wexit-time-destructors"],
             enabled: true,
         },
         linux: {
-            srcs: [
-                "chrono_utils.cpp",
-                "errors_unix.cpp",
-            ],
+            srcs: ["errors_unix.cpp"],
             cppflags: ["-Wexit-time-destructors"],
-            host_ldlibs: ["-lrt"],
         },
         windows: {
             srcs: [
@@ -98,14 +88,7 @@
     ],
     target: {
         android: {
-            srcs: [
-                "chrono_utils_test.cpp",
-                "properties_test.cpp"
-            ],
-        },
-        linux: {
-            srcs: ["chrono_utils_test.cpp"],
-            host_ldlibs: ["-lrt"],
+            srcs: ["properties_test.cpp"],
         },
         windows: {
             srcs: ["utf8_test.cpp"],