message: Remove jni_generator_helper.h from video_jni.
  This is already part of native_api_jni.
  Cr-Commit-Position: refs/heads/main@{#38346}
diff: @@ -625,7 +625,6 @@ if (current_os == "linux" || is_android) {
  "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",
  