Revert 6481 and 6482

Revert 6482 "Update webrtc to fix unpack_lib expansion."
Revert 6481 "Update generated asm offsets scripts."

The roll has not been successful. Reverted based on the request of the
committer.


TBR=turaj

Review URL: https://webrtc-codereview.appspot.com/17759004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6495 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/DEPS b/DEPS
index a66edc9..91c29ea 100644
--- a/DEPS
+++ b/DEPS
@@ -96,7 +96,7 @@
     From("chromium_deps", "src/third_party/libsrtp"),
 
   "third_party/libvpx":
-    Var("chromium_trunk") + "/deps/third_party/libvpx@278063",
+    Var("chromium_trunk") + "/deps/third_party/libvpx@269083",
 
   "third_party/libyuv":
     (Var("googlecode_url") % "libyuv") + "/trunk@1000",