Roll libjingle 175:177

This roll includes various minor cleanups and fixes.

Review URL: https://chromiumcodereview.appspot.com/10891048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@154192 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/DEPS b/DEPS
index 262906f4..8e10d0a8 100644
--- a/DEPS
+++ b/DEPS
@@ -18,7 +18,7 @@
   "nacl_tools_revision": "9330",  # native_client/DEPS: tools_rev
   "gtm_revision": "534",
 
-  "libjingle_revision": "175",
+  "libjingle_revision": "177",
   "libphonenumber_revision": "456",
   "libvpx_revision": "152423",
   "lss_revision": "11",