AU: Use crossystem hwid to obtain the hardware class.

This is more portable than reading the HWID from the ACPI file and should work
on ARM.

BUG=chromium-os:15255
TEST=unit tests, ran AU on Cr-48, checked the Omaha update check request

Change-Id: I8a2750140da7da99c217a6976f46b1b226696276
Reviewed-on: http://gerrit.chromium.org/gerrit/1078
Tested-by: Darin Petkov <petkov@chromium.org>
Reviewed-by: Thieu Le <thieule@chromium.org>
diff --git a/omaha_request_params.h b/omaha_request_params.h
index 7864370..edaba67 100644
--- a/omaha_request_params.h
+++ b/omaha_request_params.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -121,10 +121,6 @@
   // Gets the machine type (e.g. "i686").
   std::string GetMachineType() const;
 
-  // Returns the hardware qualification ID of the system, or empty
-  // string if the HWID is unavailable.
-  std::string GetHardwareClass() const;
-
   // When reading files, prepend root_ to the paths. Useful for testing.
   std::string root_;