Removed the old policy protobufs location.

chrome/browser/policy/proto/chromeos/install_attributes.proto

Index: chrome/browser/policy/proto/chromeos/install_attributes.proto
diff --git a/chrome/browser/policy/proto/chromeos/install_attributes.proto b/chrome/browser/policy/proto/chromeos/install_attributes.proto
deleted file mode 100644
index f1442f4ff35a1ab53861a6fc5bafe0f8970a740c..0000000000000000000000000000000000000000
--- a/chrome/browser/policy/proto/chromeos/install_attributes.proto
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2011 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.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package cryptohome;
-
-// This must match install_attributes.proto in the Chromium OS cryptohome
-// repository. Only the fields that are relevant to the browser are present
-// here.
-message SerializedInstallAttributes {
-  message Attribute {
-    required string name = 1;
-    required bytes value = 2;
-  }
-  repeated Attribute attributes = 2;
-}