Switch from build-time to run-time flags for Project Spitzer.

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 166 matching lines @@
   'src/third_party/webgl/src':
    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '43331afad7fbd83697c8482b999b13191cf8cfe2',
 
   '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' + '@' +  'ecb8dff7682da7a42330ddd18c307a66aca7c875',
 
   'src/third_party/ffmpeg':
-   Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '8b946dec70ca7985098525d0e9dccc8daa42ef47',
+   Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + 'a3d30daebf9e75fcd16fc401b069525467a89530',
 
   'src/third_party/libjingle/source/talk':
     Var('chromium_git') + '/external/webrtc/trunk/talk.git' + '@' + 'b7037034bc843dd1e7ff8a3b40439f8ead2dd823', # commit position 11031
 
   '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' + '@' + 'b8dd754b4fa05fd4cf1c2e8dc3b1ac976280e41a', # from svn revision 295151
 
@@ skipping 611 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'],
   },
 ]