Removed custom FFmpegLock. Removed ffmpeg headers from third_party/ffmpeg/include.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 55019b86522914c70efe354317de30c80dab17a4..98e77580ee3b89e46f1eb2a27fd2af9be5791c7e 100644
--- a/DEPS
+++ b/DEPS
@@ -101,6 +101,10 @@ deps = {
 
   "src/third_party/swig/Lib":
     "/trunk/deps/third_party/swig/Lib@" + Var("swig_revision"),
+
+  "src/third_party/ffmpeg/source/patched-ffmpeg-mt":
+    "/trunk/deps/third_party/ffmpeg/patched-ffmpeg-mt@" +
+    Var("ffmpeg_revision"),
 }
 
 
@@ -165,9 +169,6 @@ deps_os = {
     # TODO(ajwong): Move this into the OS-independent block.
     "src/third_party/yasm/source/patched-yasm":
       "/trunk/deps/third_party/yasm/patched-yasm@29937",
-    "src/third_party/ffmpeg/source/patched-ffmpeg-mt":
-      "/trunk/deps/third_party/ffmpeg/patched-ffmpeg-mt@" +
-      Var("ffmpeg_revision"),
 
     "src/third_party/swig/mac":
       "/trunk/deps/third_party/swig/mac@" + Var("swig_revision"),
@@ -186,9 +187,6 @@ deps_os = {
     # TODO(ajwong): Move this into the OS-independent block.
     "src/third_party/yasm/source/patched-yasm":
       "/trunk/deps/third_party/yasm/patched-yasm@29937",
-    "src/third_party/ffmpeg/source/patched-ffmpeg-mt":
-      "/trunk/deps/third_party/ffmpeg/patched-ffmpeg-mt@" +
-      Var("ffmpeg_revision"),
 
     "src/third_party/swig/linux":
       "/trunk/deps/third_party/swig/linux@" + Var("swig_revision"),