Roll src/native_client/ 6c6f5e2b5..2ca9149a9 (6 commits).
Roll src/native_client/ 6c6f5e2b5..2ca9149a9 (6 commits).

https://chromium.googlesource.com/native_client/src/native_client.git/+log/6c6f5e2b5863..2ca9149a9b43

$ git log 6c6f5e2b5..2ca9149a9 --date=short --no-merges --format='%ad %ae %s'
2016-02-24 mseaborn Cleanup: Remove buildbot_valgrind.sh, since it is no longer used
2016-02-24 phosek PNaCl: Update clang and llvm revision in pnacl/COMPONENT_REVISIONS
2016-02-24 mcgrathr Deploy new nacl_arm_glibc toolchain
2016-02-24 phosek Remove Emscripten support
2016-02-24 dschuff Re-enable sandboxed translator tests on mac
2016-02-23 mseaborn PNaCl dynamic linking: Add initial version of a PLL loader libary

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/1730123003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#377500}

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