Roll src/native_client/ 5481c6bda..1481b58cb (1 commit).
Roll src/native_client/ 5481c6bda..1481b58cb (1 commit).

https://chromium.googlesource.com/native_client/src/native_client.git/+log/5481c6bda9eb..1481b58cb78a

$ git log 5481c6bda..1481b58cb --date=short --no-merges --format='%ad %ae %s'
2016-02-25 mseaborn pthread.h: Remove unneeded #define, NC_INVALID_HANDLE

CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_dbg_32_ng,linux_nacl_sdk_build
TBR=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/1732333003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#377721}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk