Rolling FFmpeg to r108357.

DEPS

 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": "99053",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
@@ skipping 10 matching lines @@
   "nacl_toolchain_mac_x86_newlib_hash":
       "280ecee659ff804d5eeca8964c31545b0d68d9c8",
   "nacl_toolchain_win_x86_newlib_hash":
       "7730f4515c745c0c012df4a1080be9a46ffcda47",
   "nacl_toolchain_linux_x86_newlib_hash":
       "596aa5b812ec4b24160ed7ce55b3fd141f929fbf",
   "nacl_toolchain_revision": "6757",
 
   "libjingle_revision": "92",
   "libvpx_revision": "107145",
-  "ffmpeg_revision": "107826",
+  "ffmpeg_revision": "108357",
   "sfntly_revision": "98",
   "skia_revision": "2579",
   "v8_revision": "9637",
   "webrtc_revision": "808",
   "jsoncpp_revision": "246",
 
   # Note: On most bots, clang is not checked out via DEPS but by
   # tools/clang/scripts/update.sh. The script reads this line here.
   # Do NOT CHANGE this if you don't know what you're doing -- see
   # http://code.google.com/p/chromium/wiki/UpdatingClang
@@ skipping 404 matching lines @@
     # which takes ~20s, but clang speeds up builds by more than 20s.
     "pattern": ".",
     "action": ["python", "src/tools/clang/scripts/update.py", "--mac-only"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]