Add comment for fix to issue 95619

The fix is very subtle.  We need the comment to ensure we don't accidentally
revert the fix.  It's also a helpful reminder that we should try to find a less
brittle solution.

BUG=95619
TEST=None


Review URL: http://codereview.chromium.org/7995015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102436 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/sync/profile_sync_service_harness.cc

@@ -1030,6 +1030,9 @@ bool ProfileSyncServiceHarness::EnableEncryptionForType(
 
 bool ProfileSyncServiceHarness::WaitForTypeEncryption(
     syncable::ModelType type) {
+  // The correctness of this if condition depends on the ordering of its
+  // sub-expressions.  See crbug.com/95619.
+  // TODO(rlarocque): Figure out a less brittle way of detecting this.
   if (IsTypeEncrypted(type) &&
       IsSynced() &&
       GetLastSessionSnapshot()->num_conflicting_updates == 0) {