Bug 813071. Remove unncessary AOSP License block. r=gerv

This code is the same as the public domain code at
"Bit Twiddling Hacks"

--HG--
extra : rebase_source : 813c7bec84250227bee13a51e2f2ca23c628055b

gfx/thebes/gfxUtils.h

@@ -152,15 +152,12 @@ namespace mozilla {
 namespace gfx {
 
 
-/*
- * Copyright 2008 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
+/* These techniques are suggested by "Bit Twiddling Hacks"
  */
 
 /**
  * Returns true if |aNumber| is a power of two
+ * 0 is incorreclty considered a power of two
  */
 static inline bool
 IsPowerOfTwo(int aNumber)