[Cleanup] Remove the obsolete Prerender field trial.

chrome/browser/prerender/prerender_browsertest.cc

 // Copyright (c) 2012 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 <deque>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 1070 matching lines @@
 #endif
     command_line->AppendSwitch(switches::kAlwaysAuthorizePlugins);
     command_line->AppendSwitch(switches::kEnableNpapi);
   }
 
   void SetPreference(NetworkPredictionOptions value) {
     browser()->profile()->GetPrefs()->SetInteger(
         prefs::kNetworkPredictionOptions, value);
   }
 
-  void CreateTestFieldTrial(const std::string& name,
-                            const std::string& group_name) {
-    base::FieldTrial* trial = base::FieldTrialList::CreateFieldTrial(
-        name, group_name);
-    trial->group();
-  }
-
-  // Verifies, for the current field trial, whether
-  // ShouldDisableLocalPredictorDueToPreferencesAndNetwork produces the desired
-  // output.
+  // Verifies whether ShouldDisableLocalPredictorDueToPreferencesAndNetwork
+  // produces the desired output.
   void TestShouldDisableLocalPredictorPreferenceNetworkMatrix(
       bool preference_wifi_network_wifi,
       bool preference_wifi_network_4g,
       bool preference_always_network_wifi,
       bool preference_always_network_4g,
       bool preference_never_network_wifi,
       bool preference_never_network_4g) {
     Profile* profile = browser()->profile();
 
     // Set real NetworkChangeNotifier singleton aside.
@@ skipping 608 matching lines @@
   NeverRunsExternalProtocolHandlerDelegate external_protocol_handler_delegate_;
   GURL dest_url_;
   scoped_ptr<net::SpawnedTestServer> https_src_server_;
   bool call_javascript_;
   bool check_load_events_;
   std::string loader_host_override_;
   std::string loader_path_;
   std::string loader_query_;
   Browser* explicitly_set_browser_;
   base::HistogramTester histogram_tester_;
-  scoped_ptr<base::FieldTrialList> field_trial_list_;
 };
 
 // Checks that a page is correctly prerendered in the case of a
 // <link rel=prerender> tag and then loaded into a tab in response to a
 // navigation.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderPage) {
   PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
   EXPECT_EQ(1, GetPrerenderDomContentLoadedEventCountForLinkNumber(0));
   histogram_tester().ExpectTotalCount("Prerender.none_PerceivedPLT", 1);
   histogram_tester().ExpectTotalCount("Prerender.none_PerceivedPLTMatched", 0);
@@ skipping 2382 matching lines @@
                        LocalPredictorDisableWorksBaseCase) {
   TestShouldDisableLocalPredictorPreferenceNetworkMatrix(
       false /*preference_wifi_network_wifi*/,
       false /*preference_wifi_network_4g*/,
       false /*preference_always_network_wifi*/,
       false /*preference_always_network_4g*/,
       false /*preference_never_network_wifi*/,
       false /*preference_never_network_4g*/);
 }
 
-// Prefetch should be allowed depending on preference and network type.
-// LocalPredictorOnCellularOnly should disable all wifi cases.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
-                       LocalPredictorDisableWorksCellularOnly) {
-  CreateTestFieldTrial("PrerenderLocalPredictorSpec",
-                       "LocalPredictorOnCellularOnly=Enabled");
-  TestShouldDisableLocalPredictorPreferenceNetworkMatrix(
-      true /*preference_wifi_network_wifi*/,
-      false /*preference_wifi_network_4g*/,
-      true /*preference_always_network_wifi*/,
-      false /*preference_always_network_4g*/,
-      true /*preference_never_network_wifi*/,
-      false /*preference_never_network_4g*/);
-}
-
-// Prefetch should be allowed depending on preference and network type.
-// LocalPredictorNetworkPredictionEnabledOnly should disable whenever
-// network predictions will not be exercised.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
-                       LocalPredictorDisableWorksNetworkPredictionEnableOnly) {
-  CreateTestFieldTrial("PrerenderLocalPredictorSpec",
-                       "LocalPredictorNetworkPredictionEnabledOnly=Enabled");
-  TestShouldDisableLocalPredictorPreferenceNetworkMatrix(
-      false /*preference_wifi_network_wifi*/,
-      true /*preference_wifi_network_4g*/,
-      false /*preference_always_network_wifi*/,
-      false /*preference_always_network_4g*/,
-      true /*preference_never_network_wifi*/,
-      true /*preference_never_network_4g*/);
-}
-
-// Prefetch should be allowed depending on preference and network type.
-// If LocalPredictorNetworkPredictionEnabledOnly and
-// LocalPredictorOnCellularOnly are both selected, we must disable whenever
-// network predictions are not exercised, or when we are on wifi.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
-                       LocalPredictorDisableWorksBothOptions) {
-  CreateTestFieldTrial("PrerenderLocalPredictorSpec",
-                       "LocalPredictorOnCellularOnly=Enabled:"
-                       "LocalPredictorNetworkPredictionEnabledOnly=Enabled");
-  TestShouldDisableLocalPredictorPreferenceNetworkMatrix(
-      true /*preference_wifi_network_wifi*/,
-      true /*preference_wifi_network_4g*/,
-      true /*preference_always_network_wifi*/,
-      false /*preference_always_network_4g*/,
-      true /*preference_never_network_wifi*/,
-      true /*preference_never_network_4g*/);
-}
-
 }  // namespace prerender