Roll ffmpeg forward by one

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 170 matching lines @@
   'src/third_party/webgl/src':
    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '29258490ea902efba0cd3ef8200299b5c31d5d26',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',
 
   'src/third_party/libvpx_new/source/libvpx':
    Var('chromium_git') + '/webm/libvpx.git' + '@' +  'f51dd8c2ac7dcdbc269918b0d0fe30920f5641f7',
 
   'src/third_party/ffmpeg':
-   Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '501a5c5db447ec2b0903551c011dfcbf6c5cd22f',
+   Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'e6e47f514216bbcdbfe796eb1f398c9afece93c8',
 
   'src/third_party/libjingle/source/talk':
     Var('chromium_git') + '/external/webrtc/trunk/talk.git' + '@' + 'd89324aa3d7d705c3d8704dd6f57409920f2c647', # commit position 11498
 
   'src/third_party/usrsctp/usrsctplib':
     Var('chromium_git') + '/external/github.com/sctplab/usrsctp' + '@' + 'c60ec8b35c3fe6027d7a3faae89d1c8d7dd3ce98',
 
   'src/third_party/libsrtp':
    Var('chromium_git') + '/chromium/deps/libsrtp.git' + '@' + '9cc4f2f799887e5d64bd28c159ea34b413f6be31', # from svn revision 295151
 
@@ skipping 627 matching lines @@
         'src/tools',
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/build/gyp_chromium'],
   },
 ]