NaCl: Update revision in DEPS, 2363d1a -> 66f4b73

This pulls in the following Native Client changes:

6c11549: (mseaborn@chromium.org) Add IRT interface for PNaCl's sandboxed linker to use to talk to Chromium
9fff96b: (teravest@chromium.org) NaCl: Remove use of NACL_BUILD_* in common.gypi.
76d6d4b: (mseaborn@chromium.org) PNaCl: Update Binutils revision in pnacl/COMPONENT_REVISIONS: use new IRT interface
a3e1e94: (jfb@chromium.org) Delete Windows time code
ea0a853: (mseaborn@chromium.org) Cleanup: Move declaration of NaClDebugExceptionHandlerRun() to src/public/
3fa058c: (mseaborn@chromium.org) Cleanup: Make nacl_desc required rather than optional in chrome_main.h
66f4b73: (mseaborn@chromium.org) Cleanup: Remove unused NaClBootstrapChannelErrorReporter and GetCrashLogOutput()

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32,linux_arm_compile,linux_nacl_sdk_build

Review URL: https://codereview.chromium.org/913553002

Cr-Commit-Position: refs/heads/master@{#315389}

DEPS

@@ -94,7 +94,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling NaCl
   # and whatever else without interference from each other.
-  'nacl_revision': '2363d1a72c7d71d91f5bb37cfec87dee68486836',
+  'nacl_revision': '66f4b739808a07084fde58a9c81e865d0f9f4185',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.