Check for embedded PAC scripts when migrating proxy pref for DRP.

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_CHROME_SETTINGS_H_
 #define CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_CHROME_SETTINGS_H_
 
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/keyed_service/core/keyed_service.h"
@@ skipping 23 matching lines @@
   // Enum values that can be reported for the
   // DataReductionProxy.ProxyPrefMigrationResult histogram. These values must be
   // kept in sync with their counterparts in histograms.xml. Visible here for
   // testing purposes.
   enum ProxyPrefMigrationResult {
     PROXY_PREF_NOT_CLEARED = 0,
     PROXY_PREF_CLEARED_EMPTY,
     PROXY_PREF_CLEARED_MODE_SYSTEM,
     PROXY_PREF_CLEARED_DRP,
     PROXY_PREF_CLEARED_GOOGLEZIP,
+    PROXY_PREF_CLEARED_PAC_GOOGLEZIP,
     PROXY_PREF_MAX
   };
 
   // Constructs a settings object. Construction and destruction must happen on
   // the UI thread.
   DataReductionProxyChromeSettings();
 
   // Destructs the settings object.
   ~DataReductionProxyChromeSettings() override;
 
@@ skipping 18 matching lines @@
   // Helper method for migrating the Data Reduction Proxy away from using the
   // proxy pref. Returns the ProxyPrefMigrationResult value indicating the
   // migration action taken.
   ProxyPrefMigrationResult MigrateDataReductionProxyOffProxyPrefsHelper(
       PrefService* prefs);
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyChromeSettings);
 };
 
 #endif  // CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_CHROME_SETTINGS_H_