Use low entropy for studies that send experiment IDs to Google properties.

components/metrics/metrics_state_manager_unittest.cc

 // 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.
 
 #include "components/metrics/metrics_state_manager.h"
 
 #include <ctype.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string>
@@ skipping 96 matching lines @@
     char current = client_id[i];
     if (i == 8 || i == 13 || i == 18 || i == 23)
       EXPECT_EQ('-', current);
     else
       EXPECT_TRUE(isxdigit(current));
   }
 }
 
 TEST_F(MetricsStateManagerTest, EntropySourceUsed_Low) {
   std::unique_ptr<MetricsStateManager> state_manager(CreateStateManager());
-  state_manager->CreateEntropyProvider();
+  state_manager->CreateDefaultEntropyProvider();
   EXPECT_EQ(MetricsStateManager::ENTROPY_SOURCE_LOW,
             state_manager->entropy_source_returned());
 }
 
 TEST_F(MetricsStateManagerTest, EntropySourceUsed_High) {
   EnableMetricsReporting();
   std::unique_ptr<MetricsStateManager> state_manager(CreateStateManager());
-  state_manager->CreateEntropyProvider();
+  state_manager->CreateDefaultEntropyProvider();
   EXPECT_EQ(MetricsStateManager::ENTROPY_SOURCE_HIGH,
             state_manager->entropy_source_returned());
 }
 
 TEST_F(MetricsStateManagerTest, LowEntropySource0NotReset) {
   std::unique_ptr<MetricsStateManager> state_manager(CreateStateManager());
 
   // Get the low entropy source once, to initialize it.
   state_manager->GetLowEntropySource();
 
@@ skipping 238 matching lines @@
 
     // The metrics-reporting-enabled date will be reset to Now().
     EXPECT_GE(prefs_.GetInt64(prefs::kMetricsReportingEnabledTimestamp),
               previous_client_info->reporting_enabled_date);
 
     stored_client_info_backup_.reset();
   }
 }
 
 }  // namespace metrics