Roll src/native_client/ 1020e8acc..5481c6bda (1 commit).
Roll src/native_client/ 1020e8acc..5481c6bda (1 commit).

https://chromium.googlesource.com/native_client/src/native_client.git/+log/1020e8acc2e1..5481c6bda9eb

$ git log 1020e8acc..5481c6bda --date=short --no-merges --format='%ad %ae %s'
2016-02-25 mseaborn pthread.h: Remove unused #define, MAX_THREAD_ID

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/1739043002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#377684}

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