Revert "Chromium changes to statically link ffmpeg."

media/base/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
@@ skipping 198 matching lines @@
 
   if (media_use_ffmpeg) {
     sources += [
       "audio_video_metadata_extractor.cc",
       "audio_video_metadata_extractor.h",
       "container_names.cc",
       "container_names.h",
       "media_file_checker.cc",
       "media_file_checker.h",
     ]
+    if (is_win) {
+      sources += [ "media_win.cc" ]
+    } else if (is_posix) {
+      sources += [ "media_posix.cc" ]
+    }
 
     deps += [ "//third_party/ffmpeg" ]
   }
 
   if (enable_browser_cdms) {
     sources += [
       "browser_cdm.cc",
       "browser_cdm.h",
       "browser_cdm_factory.cc",
       "browser_cdm_factory.h",
     ]
   }
 
   if (is_android) {
+    sources += [ "media_stub.cc" ]
     public_deps = [
       "//media/base/android",
       "//media/base/android:media_java",
       "//media/base/android:media_jni_headers",
       "//media/base/android:video_capture_jni_headers",
     ]
     allow_circular_includes_from += [ "//media/base/android" ]
   }
 
   if (is_linux && use_x11) {
@@ skipping 283 matching lines @@
       if (is_posix) {
         yasm_flags += [ "-DELF" ]
         if (current_cpu == "x64") {
           # TODO(ajwong): Why isn't this true in mac?
           yasm_flags += [ "-DPIC" ]
         }
       }
     }
   }
 }