u4                111 third_party/tcmalloc/chromium/src/system-alloc.cc typedef uint32_t u4;
u4                 39 third_party/zlib/crc32.c        typedef unsigned int u4;
u4                 42 third_party/zlib/crc32.c          typedef unsigned long u4;
u4                 45 third_party/zlib/crc32.c            typedef unsigned short u4;