The uint32_t/uint64_t types are more portable than the old style, pre
C99 u_int32_t/u_int64_t types.

R=yangguo@chromium.org
BUG=v8:5086

Review-Url: https://codereview.chromium.org/2080573002
Cr-Commit-Position: refs/heads/master@{#37088}