Switch base/ registrations to a static class method where appropriate.

base/message_pump_android.cc

Index: base/message_pump_android.cc
diff --git a/base/message_pump_android.cc b/base/message_pump_android.cc
index 25f7fb78473f82775de6304e599fd1c4cfbe07c6..2bc904afe6b539d53e2a9cfb21d254cf20a533d7 100644
--- a/base/message_pump_android.cc
+++ b/base/message_pump_android.cc
@@ -132,8 +132,8 @@ void MessagePumpForUI::ScheduleDelayedWork(const TimeTicks& delayed_work_time) {
       g_system_message_handler_obj.Get().obj(), millis);
 }
 
-// Register native methods
-bool RegisterSystemMessageHandler(JNIEnv* env) {
+// static
+bool MessagePumpForUI::RegisterBindings(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }