NaCl: Update revision in DEPS, 296d9ac -> 0c53990
NaCl: Update revision in DEPS, 296d9ac -> 0c53990

This pulls in the following Native Client changes:

2a14e71: (mseaborn@chromium.org) Fix a Python file to pass presubmit checks
6a2754e: (thakis@chromium.org) Let nacl builds use update.py instead of update.sh.
324f4ec: (mseaborn@chromium.org) Fix copyright notices in various files to pass the presubmit check
932d9d9: (mseaborn@chromium.org) Cleanup: Remove "#end" ("#endif" etc.) comments from Python code
da7b21e: (mseaborn@chromium.org) Cleanup: Avoid creating an address space hole during startup on Unix
7521635: (stichnot@chromium.org) Modify spec2k run script so it doesn't blow away valuable Subzero files.
fe6f59f: (mseaborn@chromium.org) Cleanup: Remove code related to MinSFI
0c53990: (mseaborn@chromium.org) Remove non-error logging from nacl_sync_raii.h

Changes: https://chromium.googlesource.com/native_client/src/native_client/+log/296d9ac73190fbd37f699461600e83b16ec0d2b3..0c539908088374d1c4074e331456644b21628a65

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_chromium_dbg_32_ng,linux_nacl_sdk_build

Review URL: https://codereview.chromium.org/1497103002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#363382}

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