AU: Remove support for old-style updates.

This code is basically untested, unused and a security risk. So, remove...

BUG=chromium-os:12542
TEST=unit tests, tested VM update

Change-Id: Ibed0582b09497acef9debdf88658cddc2b5cecce
Reviewed-on: http://gerrit.chromium.org/gerrit/8728
Tested-by: Darin Petkov <petkov@chromium.org>
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Ready: Darin Petkov <petkov@chromium.org>
diff --git a/omaha_response_handler_action.cc b/omaha_response_handler_action.cc
index 74e149f..c83b328 100644
--- a/omaha_response_handler_action.cc
+++ b/omaha_response_handler_action.cc
@@ -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.
 
@@ -53,13 +53,6 @@
   install_plan_.kernel_install_path =
       utils::BootKernelDevice(install_plan_.install_path);
 
-  install_plan_.is_full_update = !response.is_delta;
-  if (!response.is_delta && utils::FileExists(key_path_.c_str())) {
-    // Can't sign old style full payloads but signature is required so bail out.
-    completer.set_code(kActionCodeSignedDeltaPayloadExpectedError);
-    return;
-  }
-
   TEST_AND_RETURN(HasOutputPipe());
   if (HasOutputPipe())
     SetOutputObject(install_plan_);