Make some field trials unforceable via command-line in the official build.

chrome/browser/chrome_browser_main.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 "chrome/browser/chrome_browser_main.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
+#include <set>
 #include <string>
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/debug/debugger.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
@@ skipping 490 matching lines @@
 void InitializeAllPrefHashStores() {
   ProfileInfoCache& profile_info_cache =
       g_browser_process->profile_manager()->GetProfileInfoCache();
   size_t n_profiles = profile_info_cache.GetNumberOfProfiles();
   for (size_t i = 0; i < n_profiles; ++i) {
     base::FilePath profile_path =
         profile_info_cache.GetPathOfProfileAtIndex(i);
     chrome_prefs::InitializePrefHashStoreIfRequired(profile_path);
   }
 }
+
 }  // namespace
 
 namespace chrome_browser {
 
 // This error message is not localized because we failed to load the
 // localization data files.
 #if defined(OS_WIN)
 const char kMissingLocaleDataTitle[] = "Missing File Error";
 #endif
 
@@ skipping 64 matching lines @@
       new base::FieldTrialList(
           metrics->CreateEntropyProvider(reporting_state).release()));
 
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kEnableBenchmarking))
     base::FieldTrial::EnableBenchmarking();
 
   // Ensure any field trials specified on the command line are initialized.
   // Also stop the metrics service so that we don't pollute UMA.
   if (command_line->HasSwitch(switches::kForceFieldTrials)) {
+    std::set<std::string> unforceable_field_trials;
+#if defined(OFFICIAL_BUILD)
+    unforceable_field_trials.insert("SettingsEnforcement");
+#endif  // defined(OFFICIAL_BUILD)
+
     // Create field trials without activating them, so that this behaves in a
     // consistent manner with field trials created from the server.
     bool result = base::FieldTrialList::CreateTrialsFromString(
         command_line->GetSwitchValueASCII(switches::kForceFieldTrials),
-        base::FieldTrialList::DONT_ACTIVATE_TRIALS);
+        base::FieldTrialList::DONT_ACTIVATE_TRIALS,
+        unforceable_field_trials);
     CHECK(result) << "Invalid --" << switches::kForceFieldTrials
                   << " list specified.";
   }
   if (command_line->HasSwitch(switches::kForceVariationIds)) {
     // Create default variation ids which will always be included in the
     // X-Client-Data request header.
     chrome_variations::VariationsHttpHeaderProvider* provider =
         chrome_variations::VariationsHttpHeaderProvider::GetInstance();
     bool result = provider->SetDefaultVariationIds(
         command_line->GetSwitchValueASCII(switches::kForceVariationIds));
@@ skipping 1077 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif
 #endif
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }