Remove NetPrefObserver class and two prefs that do not do anything.

chrome/browser/policy/configuration_policy_handler_list_factory.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/policy/configuration_policy_handler_list_factory.h"
 
 #include <limits.h>
 #include <stddef.h>
 
 #include <utility>
@@ skipping 89 matching lines @@
     base::Value::TYPE_BOOLEAN },
   { key::kBuiltInDnsClientEnabled,
     prefs::kBuiltInDnsClientEnabled,
     base::Value::TYPE_BOOLEAN },
   { key::kWPADQuickCheckEnabled,
     prefs::kQuickCheckEnabled,
     base::Value::TYPE_BOOLEAN },
   { key::kPacHttpsUrlStrippingEnabled,
     prefs::kPacHttpsUrlStrippingEnabled,
     base::Value::TYPE_BOOLEAN },
-  { key::kDisableSpdy,
-    prefs::kDisableSpdy,
-    base::Value::TYPE_BOOLEAN },
   { key::kSafeBrowsingEnabled,
     prefs::kSafeBrowsingEnabled,
     base::Value::TYPE_BOOLEAN },
   { key::kForceGoogleSafeSearch,
     prefs::kForceGoogleSafeSearch,
     base::Value::TYPE_BOOLEAN },
   { key::kForceYouTubeSafetyMode,
     prefs::kForceYouTubeSafetyMode,
     base::Value::TYPE_BOOLEAN },
   { key::kPasswordManagerEnabled,
@@ skipping 736 matching lines @@
       SimpleSchemaValidatingPolicyHandler::RECOMMENDED_ALLOWED,
       SimpleSchemaValidatingPolicyHandler::MANDATORY_PROHIBITED)));
   handlers->AddHandler(base::WrapUnique(
       new chromeos::KeyPermissionsPolicyHandler(chrome_schema)));
 #endif  // defined(OS_CHROMEOS)
 
   return handlers;
 }
 
 }  // namespace policy