Region::validate() cannot be called from addRectUnchecked()

addRectUnchecked() is allowed to be in an invalid state
temporarily.

Change-Id: I6f5162b5c49f378978c070a77abba35023fe918c
diff --git a/libs/ui/Region.cpp b/libs/ui/Region.cpp
index db69e16..932ef68 100644
--- a/libs/ui/Region.cpp
+++ b/libs/ui/Region.cpp
@@ -114,10 +114,6 @@
     Rect rect(l,t,r,b);
     size_t where = mStorage.size() - 1;
     mStorage.insertAt(rect, where, 1);
-
-#if VALIDATE_REGIONS
-    validate(*this, "addRectUnchecked");
-#endif
 }
 
 // ----------------------------------------------------------------------------