NaCl: Update revision in DEPS, 8191c1a -> 66c300e
NaCl: Update revision in DEPS, 8191c1a -> 66c300e

This pulls in the following Native Client changes:

8c0ad9f: (brettw@chromium.org) Pull build directory into standalone native client checkouts.
ef7004b: (mseaborn@chromium.org) Cleanup: Merge the Unix/Windows implementations of NaClSysClock()
ab37312: (dschuff@chromium.org) Support nacl-clang in calingconv_case_by_case test
64bc071: (mseaborn@chromium.org) Cleanup: Use NACL_DEFINE/REGISTER_SYSCALL instead of NaClAddSyscall() in tests
3e51032: (dschuff@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
66c300e: (dschuff@chromium.org) Update revision for PNaCl

Changes: https://chromium.googlesource.com/native_client/src/native_client/+log/8191c1a953ca5896c715cb21e7a24d8c092f925f..66c300e071cf3e1c1fb98f9a3e15bb02b4388d72

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

Review URL: https://codereview.chromium.org/1199253005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#336038}

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