Avoid integer overflow errors when parsing Exp-Golomb codes

media/filters/h264_bit_reader.cc

Index: media/filters/h264_bit_reader.cc
diff --git a/media/filters/h264_bit_reader.cc b/media/filters/h264_bit_reader.cc
index 5b009a18281408ad4345e529e706de959a1bb5f8..145d2e193737fd0dd196731cb134a024e204057b 100644
--- a/media/filters/h264_bit_reader.cc
+++ b/media/filters/h264_bit_reader.cc
@@ -79,7 +79,7 @@ bool H264BitReader::ReadBits(int num_bits, int* out) {
   }
 
   *out |= (curr_byte_ >> (num_remaining_bits_in_curr_byte_ - bits_left));
-  *out &= ((1 << num_bits) - 1);
+  *out &= ((1u << num_bits) - 1u);
   num_remaining_bits_in_curr_byte_ -= bits_left;
 
   return true;