DEPS: Remove obsolete reference to "native_client/src/third_party/ppapi"

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 349 matching lines @@
     'src/testing/iossim/third_party/class-dump':
      Var('chromium_git') + '/chromium/deps/class-dump.git' + '@' + '89bd40883c767584240b4dade8b74e6f57b9bdab',
 
     # Code that's not needed due to not building everything
     'src/build/util/support': None,
     'src/chrome/test/data/extensions/api_test/permissions/nacl_enabled/bin': None,
     'src/chrome/test/data/perf/canvas_bench': None,
     'src/chrome/test/data/perf/frame_rate/content': None,
     'src/media/cdm/ppapi/api': None,
     'src/native_client': None,
-    'src/native_client/src/third_party/ppapi': None,
     'src/third_party/bidichecker': None,
     'src/third_party/brotli/src': None,
     'src/third_party/cld_2/src': None,
     'src/third_party/ffmpeg': None,
     'src/third_party/hunspell_dictionaries': None,
     'src/third_party/hunspell': None,
     'src/third_party/libc++/trunk': None,
     'src/third_party/libc++abi/trunk': None,
     'src/third_party/libexif/sources': None,
     'src/third_party/libjpeg_turbo': None,
@@ skipping 414 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]