Update .gitignore.

TBR=grunell
Review URL: https://codereview.chromium.org/11263006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@163798 0039d316-1c4b-4281-b951-d872f2087c98

.gitignore

@@ -236,9 +236,7 @@ v8.log
 /third_party/webgl_conformance
 /third_party/webpagereplay/
 /third_party/webrtc
-/third_party/webrtc/common_audio/signal_processing/internal
-/third_party/webrtc/modules/audio_coding/codecs/celt
-/third_party/webrtc/modules/audio_coding/codecs/speex
+/third_party/webrtc/internal
 /third_party/webrtc/modules/video_coding/codecs/vp8_internal
 /third_party/widevine/cdm/binaries
 /third_party/widevine/cdm/symbols