Fix modules_unittests on iOS.

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc

Index: webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc
diff --git a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc
index c6c0406128f05d2c818b0a94212ea5cb1377bc60..2bc1d8f53be8ab6280d17ac22b7303925f1cf712 100644
--- a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc
+++ b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc
@@ -264,10 +264,10 @@ bool H264AnnexBBufferHasVideoFormatDescription(const uint8_t* annexb_buffer,
   if (is_first_nalu_type_sps)
     return true;
   bool is_first_nalu_type_aud = first_nalu_type == kAud;
-  // Start code + access unit delimiter + start code = 4 + 2 + 4 = 10.
-  if (!is_first_nalu_type_aud || annexb_buffer_size <= 10u)
+  // Start code + access unit delimiter + start code = 4 + 1 + 4 = 9.

[tkchin_webrtc, 2016/09/28 10:35:02]

I looked and I think that 10 is correct
start code + nalu type byte + aud byte + start code = 4 + 1 + 1 + 4 = 10

[kthelgason, 2016/09/28 10:46:45]

You're right, I forgot to count the type byte. Adding 1-digit numbers can be
hard! The actual aud byte is missing from the test. I'll change it.

+  if (!is_first_nalu_type_aud || annexb_buffer_size <= 9u)
     return false;
-  NaluType second_nalu_type = ParseNaluType(annexb_buffer[10]);
+  NaluType second_nalu_type = ParseNaluType(annexb_buffer[9]);
   bool is_second_nalu_type_sps = second_nalu_type == kSps;
   return is_second_nalu_type_sps;
 }