Rewrite the Android implementation of BatteryMonitor directly in Java.

content/app/android/library_loader_hooks.cc

Index: content/app/android/library_loader_hooks.cc
diff --git a/content/app/android/library_loader_hooks.cc b/content/app/android/library_loader_hooks.cc
index 36078694cd46e9ed16cfeda6cda7315ee1e792e6..6c16506c8e54142c6bb8e724e91b7c7eb6a14820 100644
--- a/content/app/android/library_loader_hooks.cc
+++ b/content/app/android/library_loader_hooks.cc
@@ -22,7 +22,6 @@
 #include "content/common/content_constants_internal.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/result_codes.h"
-#include "device/battery/android/battery_jni_registrar.h"
 #include "device/vibration/android/vibration_jni_registrar.h"
 #include "media/base/android/media_jni_registrar.h"
 #include "net/android/net_jni_registrar.h"
@@ -65,9 +64,6 @@ bool EnsureJniRegistered(JNIEnv* env) {
     if (!content::android::RegisterAppJni(env))
       return false;
 
-    if (!device::android::RegisterBatteryJni(env))
-      return false;
-
     if (!device::android::RegisterVibrationJni(env))
       return false;