Update the notice about the slow Chromium sync.

It's no longer valid to run 'git auto-svn' since we've
moved over to Git.

R=phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/50489004

Cr-Commit-Position: refs/heads/master@{#8880}
diff --git a/sync_chromium.py b/sync_chromium.py
index cc850f4..35d693e 100755
--- a/sync_chromium.py
+++ b/sync_chromium.py
@@ -148,14 +148,12 @@
     args += ['--deps=' + target_os_list]
 
   print textwrap.dedent("""\
-  +--------------------------------------------------------------------+
-  | NOTICE: This sync of Chromium will take a very long time the first |
-  |         time you checkout WebRTC as several gigabytes of data has  |
-  |         to be downloaded. Make sure you don't abort this download  |
-  |         or you will have to issue a 'gclient sync' followed by a   |
-  |         'git auto-svn' to complete the initial setup. If that      |
-  |         fails, you have to wipe everything clean and start over.   |
-  +--------------------------------------------------------------------+""")
+  +---------------------------------------------------------------------+
+  | NOTICE: This sync of Chromium will take a long time as several      |
+  |         gigabytes of data are downloaded. If this is your initial   |
+  |         sync and it's interrupted, try running 'gclient sync' again.|
+  |         If that fails, wipe everything clean and start over again.  |
+  +---------------------------------------------------------------------+""")
   print 'Running "%s" in %s' % (' '.join(args), opts.chromium_dir)
   ret = subprocess.call(args, cwd=opts.chromium_dir, env=env)
   if ret == 0: