Lands http://codereview.chromium.org/201102 for Oshima:

Don't allow updating group id once it's set.


BUG=none
TEST=none


Review URL: http://codereview.chromium.org/205001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@26132 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/views/view.cc b/views/view.cc
index 8664ad9..c5db5db 100644
--- a/views/view.cc
+++ b/views/view.cc
@@ -791,6 +791,8 @@
 }
 
 void View::SetGroup(int gid) {
+  // Don't change the group id once it's set.
+  DCHECK(group_ == -1 || group_ == gid);
   group_ = gid;
 }