Update webrtc to 2881 and libjingle to 202.

DEPS

 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 
 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
   "webkit_revision": "131095",
   "chromium_git": "http://git.chromium.org/git",
   "chromiumos_git": "http://git.chromium.org/chromiumos",
   "swig_revision": "69281",
   "nacl_revision": "9970",
   # After changing nacl_revision, run 'glient sync' and check native_client/DEPS
   # to update other nacl_*_revision's.
   "nacl_tools_revision": "9330",  # native_client/DEPS: tools_rev
   "gtm_revision": "578",
 
-  "libjingle_revision": "199",
+  "libjingle_revision": "203",
   "libphonenumber_revision": "456",
   "libvpx_revision": "152423",
   "lss_revision": "13",
 
   # These two FFmpeg variables must be updated together.  One is used for SVN
   # checkouts and the other for Git checkouts.
   "ffmpeg_revision": "159317",
   "ffmpeg_hash": "3a9bce0eec65d13e2cf071e51757b7e90d082a4f",
 
   "sfntly_revision": "134",
   "skia_revision": "5891",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   "v8_revision": "12693",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.
-  "webrtc_revision": "2718",
+  "webrtc_revision": "2918",
   "jsoncpp_revision": "248",
   "nss_revision": "158129",
 }
 
 deps = {
   "src/breakpad/src":
     (Var("googlecode_url") % "google-breakpad") + "/trunk/src@1069",
 
   "src/googleurl":
     (Var("googlecode_url") % "google-url") + "/trunk@179",
@@ skipping 558 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/util/lastchange.py",
                "-o", "src/build/util/LASTCHANGE"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]