blimp: Remove unneeded RegisterNatives() call

blimp/client/core/android/dummy_blimp_client_context_android.h

Index: blimp/client/core/android/dummy_blimp_client_context_android.h
diff --git a/blimp/client/core/android/dummy_blimp_client_context_android.h b/blimp/client/core/android/dummy_blimp_client_context_android.h
index 87f93453db1dbbad3829faa4a6c557d5af3812db..09923c67554e436948a173c803f2380403aa5ca3 100644
--- a/blimp/client/core/android/dummy_blimp_client_context_android.h
+++ b/blimp/client/core/android/dummy_blimp_client_context_android.h
@@ -16,7 +16,6 @@ namespace client {
 // JNI bridge between DummyBlimpClientContext in Java and C++.
 class DummyBlimpClientContextAndroid : public base::SupportsUserData::Data {
  public:
-  static bool RegisterJni(JNIEnv* env);
   static DummyBlimpClientContextAndroid* FromJavaObject(JNIEnv* env,
                                                         jobject jobj);
   base::android::ScopedJavaLocalRef<jobject> GetJavaObject();