Android JNI gen: Don't emit code for empty RegisterNatives()

chromecast/base/cast_sys_info_android.h

Index: chromecast/base/cast_sys_info_android.h
diff --git a/chromecast/base/cast_sys_info_android.h b/chromecast/base/cast_sys_info_android.h
index 0cc4b55ea04a3202232ddedcd0fb085f314dc182..4f1fe94b27cb7e4cec9e71e333f899126b395c63 100644
--- a/chromecast/base/cast_sys_info_android.h
+++ b/chromecast/base/cast_sys_info_android.h
@@ -20,8 +20,6 @@ namespace chromecast {
 
 class CastSysInfoAndroid : public CastSysInfo {
  public:
-  static bool RegisterJni(JNIEnv* env);
-
   CastSysInfoAndroid();
   ~CastSysInfoAndroid() override;
 
@@ -43,9 +41,6 @@ class CastSysInfoAndroid : public CastSysInfo {
   std::string GetGlRenderer() override;
   std::string GetGlVersion() override;
 
-  // Native implementation of Java methods.
-  void DeviceNameChanged(JNIEnv* env, jobject obj, jstring device_name);
-
  private:
   const base::android::BuildInfo* const build_info_;