Remove unnecessary DeleteLocalRef usage

Keeping the ones inside loops, because theoretically they
can be useful there (in practice, for this use case, it's
highly unlikely to make any difference).

PiperOrigin-RevId: 272834073

extensions/flac/src/main/jni/flac_jni.cc

@@ -46,7 +46,6 @@ class JavaDataSource : public DataSource {
     if (mid == NULL) {
       jclass cls = env->GetObjectClass(flacDecoderJni);
       mid = env->GetMethodID(cls, "read", "(Ljava/nio/ByteBuffer;)I");
-      env->DeleteLocalRef(cls);
     }
   }
 
@@ -57,7 +56,6 @@ class JavaDataSource : public DataSource {
       // Exception is thrown in Java when returning from the native call.
       result = -1;
     }
-    env->DeleteLocalRef(byteBuffer);
     return result;
   }