Remove empty/unused NSS dependency from DEPS.

DEPS

 # This file contains dependencies for WebRTC.
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'chromium_revision': '33a7a547b95490ef9f24c8a24d9fa35800df1595',
   'boringssl_git': 'https://boringssl.googlesource.com',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
   'swarming_revision': '11e31afa5d330756ff87aa12064bb5d032896cb5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.
   'openmax_dl_revision': '7acede9c039ea5d14cf326f44aad1245b9e674a7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
   'boringssl_revision': '0f28691d3d3d2851079feeb9e3c6baaff99ee455',
   # Three lines of non-changing comments so that
-  # the commit queue can handle CLs rolling nss
-  # and whatever else without interference from each other.
-  'nss_revision': 'db89506ac363956b4b253db881219eb5d6246781',
-  # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lss
   # and whatever else without interference from each other.
   'lss_revision': '3f6478ac95edf86cd3da300c2c0d34a438f5dbeb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.
   'catapult_revision': '794fff6c814784ad5f9a2b33b52d74cf1148d91f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.
@@ skipping 33 matching lines @@
     Var('chromium_git') + '/chromium/llvm-project/llvm/lib/Fuzzer.git' + '@' +  Var('libfuzzer_revision'),
 
   'src/third_party/libjpeg_turbo':
     Var('chromium_git') + '/chromium/deps/libjpeg_turbo.git' + '@' + '7260e4d8b8e1e40b17f03fafdf1cd83296900f76',
   'src/third_party/libsrtp':
    Var('chromium_git') + '/chromium/deps/libsrtp.git' + '@' + '0e0936f3013fe5884eac82f95e370c8d460a179f',
   'src/third_party/libvpx/source/libvpx':
     Var('chromium_git') + '/webm/libvpx.git' + '@' +  '4d4231352c8cefdae2e76b7bad4286ec21747c89',
   'src/third_party/libyuv':
     Var('chromium_git') + '/libyuv/libyuv.git' + '@' + 'b18fd21d3c27fce69b5c1ed44b89131dedc87284',
-  'src/third_party/nss':
-    Var('chromium_git') + '/chromium/deps/nss.git' + '@' + Var('nss_revision'),
   'src/third_party/openh264/src':
     Var('chromium_git') + '/external/github.com/cisco/openh264' + '@' + '0fd88df93c5dcaf858c57eb7892bd27763f0f0ac',
   'src/third_party/openmax_dl':
     Var('chromium_git') + '/external/webrtc/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),
   'src/third_party/usrsctp/usrsctplib':
     Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + '8679f2b0bf063ac894dc473debefd61dbbebf622',
   'src/third_party/yasm/source/patched-yasm':
     Var('chromium_git') + '/chromium/deps/yasm/patched-yasm.git' + '@' + '7da28c6c7c6a1387217352ce02b31754deb54d2a',
   'src/tools':
     Var('chromium_git') + '/chromium/src/tools' + '@' + 'e4e78e067865bff9f1f23aa776b41e88f1a40abc',
@@ skipping 438 matching lines @@
   },
 ]
 
 recursedeps = [
   # buildtools provides clang_format, libc++, and libc++abi.
   'src/buildtools',
   # android_tools manages the NDK.
   'src/third_party/android_tools',
 ]