Avoid syncing unnecessary Chromium deps for WebRTC.

This should save several gigabytes of traffic and disk space.

On Linux this is about 2.6 GB:
346M	src/chrome/tools/test/reference_build
340M	src/native_client
170M	src/third_party/ffmpeg
1.5G	src/third_party/WebKit
196M	src/v8

BUG=2863
TESTED=Removed the directories locally, ran a sync and verified they didn't reappear (or fail because of platform-specific ones).
R=iannucci@chromium.org, niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/22189004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6984 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/sync_chromium.py b/sync_chromium.py
index 1957d217..d02346c 100755
--- a/sync_chromium.py
+++ b/sync_chromium.py
@@ -14,7 +14,7 @@
 
 # Bump this whenever the algorithm changes and you need bots/devs to re-sync,
 # ignoring the .last_sync_chromium file
-SCRIPT_VERSION = 1
+SCRIPT_VERSION = 2
 
 ROOT_DIR = os.path.dirname(os.path.abspath(__file__))