Merge "Improve comment for why license_type by_exception"

#     CONSULT THE OWNERS AND opensource-licensing@google.com BEFORE

#     DEPENDING ON IT IN YOUR PROJECT. ***

third_party {

  # would be NOTICE save for drm/mediadrm/plugins/clearkey/hidl/

  # would be NOTICE save for Widevine Master License Agreement in:

  #   drm/mediadrm/plugins/clearkey/hidl/DeviceFiles.cpp

  #   drm/mediadrm/plugins/clearkey/hidl/MemoryFileSystem.cpp

  #   drm/mediadrm/plugins/clearkey/hidl/include/DeviceFiles.h

  #   drm/mediadrm/plugins/clearkey/hidl/protos/DeviceFiles.proto

  #   drm/mediadrm/plugins/clearkey/hidl/include/MemoryFileSystem.h

  # and patent disclaimers in:

  #   media/codec2/components/aac/patent_disclaimer.txt

  #   media/codec2/components/amr_nb_wb/patent_disclaimer.txt

  #   media/codec2/components/mp3/patent_disclaimer.txt

  #   media/codec2/components/mpeg4_h263/patent_disclaimer.txt

  #   media/codecs/amrnb/patent_disclaimer.txt

  #   media/codecs/amrwb/dec/patent_disclaimer.txt

  #   media/codecs/amrwb/enc/patent_disclaimer.txt

  #   media/codecs/m4v_h263/patent_disclaimer.txt

  #   media/codecs/mp3dec/patent_disclaimer.txt

  #   media/libstagefright/codecs/aacenc/patent_disclaimer.txt

  license_type: BY_EXCEPTION_ONLY

}