Componentize proxy code from chrome/browser/net

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc

Index: chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
index b8471ea56909617de6df5e46651da67aeeb41878..023b5aa94b2fcee9b1c74d451bfdde62b18fe678 100644
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
+++ b/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
@@ -95,13 +95,13 @@ DataReductionProxyChromeSettings::ProxyPrefMigrationResult
 DataReductionProxyChromeSettings::MigrateDataReductionProxyOffProxyPrefsHelper(
     PrefService* prefs) {
   base::DictionaryValue* dict =
-      (base::DictionaryValue*)prefs->GetUserPrefValue(prefs::kProxy);
+      (base::DictionaryValue*)prefs->GetUserPrefValue(ProxyPrefs::kProxy);
   if (!dict)
     return PROXY_PREF_NOT_CLEARED;
 
   // Clear empty "proxy" dictionary created by a bug. See http://crbug/448172.
   if (dict->empty()) {
-    prefs->ClearPref(prefs::kProxy);
+    prefs->ClearPref(ProxyPrefs::kProxy);
     return PROXY_PREF_CLEARED_EMPTY;
   }
 
@@ -111,7 +111,7 @@ DataReductionProxyChromeSettings::MigrateDataReductionProxyOffProxyPrefsHelper(
   // Clear "system" proxy entry since this is the default. This entry was
   // created by bug (http://crbug/448172).
   if (ProxyModeToString(ProxyPrefs::MODE_SYSTEM) == mode) {
-    prefs->ClearPref(prefs::kProxy);
+    prefs->ClearPref(ProxyPrefs::kProxy);
     return PROXY_PREF_CLEARED_MODE_SYSTEM;
   }
 
@@ -135,7 +135,7 @@ DataReductionProxyChromeSettings::MigrateDataReductionProxyOffProxyPrefsHelper(
     else
       return PROXY_PREF_NOT_CLEARED;
 
-    prefs->ClearPref(prefs::kProxy);
+    prefs->ClearPref(ProxyPrefs::kProxy);
     return rv;
   }
 
@@ -157,7 +157,7 @@ DataReductionProxyChromeSettings::MigrateDataReductionProxyOffProxyPrefsHelper(
     if (pac_script.find(".googlezip.net:") == std::string::npos)
       return PROXY_PREF_NOT_CLEARED;
 
-    prefs->ClearPref(prefs::kProxy);
+    prefs->ClearPref(ProxyPrefs::kProxy);
     return PROXY_PREF_CLEARED_PAC_GOOGLEZIP;
   }