Updated usrsctp to latest version with fixes upstream. Fixed usrsctp gyp file; removed overides.

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://svn.code.sf.net/p/%(repo)s/code",
   "webkit_trunk": "http://src.chromium.org/blink/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
@@ skipping 157 matching lines @@
   "src/third_party/ffmpeg":
     "/trunk/deps/third_party/ffmpeg@" +
     Var("ffmpeg_revision"),
 
   "src/third_party/libjingle/source/talk":
     (Var("googlecode_url") % "webrtc") + "/stable/talk@" +
     Var("webrtc_revision"),
 
   "src/third_party/usrsctp/usrsctplib":
     (Var("googlecode_url") % "sctp-refimpl") +
-    "/trunk/KERN/usrsctp/usrsctplib@8554",
+    "/trunk/KERN/usrsctp/usrsctplib@8603",
 
   "src/third_party/libsrtp":
     "/trunk/deps/third_party/libsrtp@214783",
 
   "src/third_party/speex":
     "/trunk/deps/third_party/speex@198168",
 
   "src/third_party/yasm/source/patched-yasm":
     "/trunk/deps/third_party/yasm/patched-yasm@167605",
 
@@ skipping 430 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "name": "landmines",
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]