Roll src/native_client/ 6d389bd09..31d93be09 (2 commits).
Roll src/native_client/ 6d389bd09..31d93be09 (2 commits).

https://chromium.googlesource.com/native_client/src/native_client.git/+log/6d389bd09ea1..31d93be09172

$ git log 6d389bd09..31d93be09 --date=short --no-merges --format='%ad %ae %s'
2016-03-11 mseaborn Clean up error handling in sel_main_chrome.c
2016-03-11 mcgrathr Add arm-glibc trybot to CQ and presubmit

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/1786013005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#380824}

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