Fix media code to work with new ffmpeg.

media/base/media_posix.cc

Index: media/base/media_posix.cc
diff --git a/media/base/media_posix.cc b/media/base/media_posix.cc
index 7be3255f2af2c30ffd1fc7fbc81c093d17fb80b7..d1b7d779b0eb0cbd78ec64691f15d3953ea1c24d 100644
--- a/media/base/media_posix.cc
+++ b/media/base/media_posix.cc
@@ -55,9 +55,9 @@ static std::string GetDSOName(tp_ffmpeg::StubModules stub_key) {
   // TODO(ajwong): Remove this once mac is migrated. Either that, or have GYP
   // set a constant that we can switch implementations based off of.
   switch (stub_key) {
-    case tp_ffmpeg::kModuleAvcodec53:
+    case tp_ffmpeg::kModuleAvcodec54:
       return FILE_PATH_LITERAL(DSO_NAME("avcodec", AVCODEC_VERSION));
-    case tp_ffmpeg::kModuleAvformat53:
+    case tp_ffmpeg::kModuleAvformat54:
       return FILE_PATH_LITERAL(DSO_NAME("avformat", AVFORMAT_VERSION));
     case tp_ffmpeg::kModuleAvutil51:
       return FILE_PATH_LITERAL(DSO_NAME("avutil", AVUTIL_VERSION));