Fix license headers in chrome/browser/feedback/proto

chrome/browser/feedback/proto/math.proto

-// Copyright 2009 Google Inc. All Rights Reserved.
-// Author: micapolos@google.com (Michal Pociecha-Los)
-//
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 // Messages containing common math data structures.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package userfeedback;
 
 // 2D Dimensions.
 message Dimensions {
   required float width = 1;
   required float height = 2;
 };
 
 // Axis-aligned rectangle in 2D space.
 message Rectangle {
   required float left = 1;
   required float top = 2;
   required float width = 3;
   required float height = 4;
 };