Use a different algorithm with the low entropy source for field trials.

chrome_frame/chrome_tab.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.
 
 // chrome_tab.cc : Implementation of DLL Exports.
 
 // Need to include this before the ATL headers below.
 #include "chrome_frame/chrome_tab.h"
 
 #include <atlsecurity.h>
@@ skipping 10 matching lines @@
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/string_piece.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/registry.h"
 #include "base/win/windows_version.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
+#include "chrome/common/metrics/entropy_provider.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "chrome_frame/bho.h"
 #include "chrome_frame/chrome_active_document.h"
 #include "chrome_frame/chrome_frame_activex.h"
 #include "chrome_frame/chrome_frame_automation.h"
 #include "chrome_frame/chrome_frame_reporting.h"
 #include "chrome_frame/chrome_launcher_utils.h"
 #include "chrome_frame/chrome_protocol.h"
 #include "chrome_frame/dll_redirector.h"
 #include "chrome_frame/exception_barrier.h"
@@ skipping 812 matching lines @@
       DCHECK(g_dll_get_class_object_redir_ptr != NULL)
           << "Found CF module with no DllGetClassObject export.";
     }
 
     // Enable trace control and transport through event tracing for Windows.
     logging::LogEventProvider::Initialize(kChromeFrameProvider);
 
     // Initialize the field test infrastructure. Must be done somewhere that
     // can only get called once. For Chrome Frame, that is here.
     g_field_trial_list = new base::FieldTrialList(
-        MetricsService::GetClientID());
+        new metrics::SHA1EntropyProvider(MetricsService::GetClientID()));
   } else if (reason == DLL_PROCESS_DETACH) {
     delete g_field_trial_list;
     g_field_trial_list = NULL;
 
     DllRedirector* dll_redirector = DllRedirector::GetInstance();
     DCHECK(dll_redirector);
     dll_redirector->UnregisterAsFirstCFModule();
 
     g_patch_helper.UnpatchIfNeeded();
 
@@ skipping 64 matching lines @@
   HRESULT hr = CustomRegistration(ALL, FALSE, false);
   return hr;
 }
 
 // Object entries go here instead of with each object, so that we can move
 // the objects to a lib. Also reduces magic.
 OBJECT_ENTRY_AUTO(CLSID_ChromeFrameBHO, Bho)
 OBJECT_ENTRY_AUTO(__uuidof(ChromeActiveDocument), ChromeActiveDocument)
 OBJECT_ENTRY_AUTO(__uuidof(ChromeFrame), ChromeFrameActivex)
 OBJECT_ENTRY_AUTO(__uuidof(ChromeProtocol), ChromeProtocol)