Remove jni_generator_helper.h from video_jni.

This is already part of native_api_jni.

Bug: b/251890128
Change-Id: Iae11fb676df788d992d3cb8ed21c68f7fe2552a9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/278630
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38346}
diff --git a/sdk/android/BUILD.gn b/sdk/android/BUILD.gn
index 9de9c2f..667cac1 100644
--- a/sdk/android/BUILD.gn
+++ b/sdk/android/BUILD.gn
@@ -625,7 +625,6 @@
       "src/jni/encoded_image.h",
       "src/jni/h264_utils.cc",
       "src/jni/java_i420_buffer.cc",
-      "src/jni/jni_generator_helper.h",
       "src/jni/native_capturer_observer.cc",
       "src/jni/native_capturer_observer.h",
       "src/jni/nv12_buffer.cc",