Resetting metrics ids on clump detection.

chrome/browser/metrics/cloned_install_detector.cc

Index: chrome/browser/metrics/cloned_install_detector.cc
diff --git a/chrome/browser/metrics/cloned_install_detector.cc b/chrome/browser/metrics/cloned_install_detector.cc
index 3ecfd2ccea742a6e4a0d5c52cf70f0b7ddc5f6c9..db52b842d1d84f256a6a5fcdd9293c0849c3c78b 100644
--- a/chrome/browser/metrics/cloned_install_detector.cc
+++ b/chrome/browser/metrics/cloned_install_detector.cc
@@ -72,8 +72,14 @@ void ClonedInstallDetector::SaveMachineId(
 
   MachineIdState id_state = ID_NO_STORED_VALUE;
   if (local_state->HasPrefPath(prefs::kMetricsMachineId)) {
-    id_state = local_state->GetInteger(prefs::kMetricsMachineId) == hashed_id ?
-        ID_UNCHANGED : ID_CHANGED;
+    if (local_state->GetInteger(prefs::kMetricsMachineId) != hashed_id) {
+      id_state = ID_CHANGED;
+      // TODO(jwd): Use a callback to set the reset pref. That way
+      // ClonedInstallDetector doesn't need to know about this pref.
+      local_state->SetBoolean(prefs::kMetricsResetIds, true);
+    } else {
+      id_state = ID_UNCHANGED;
+    }
   }
 
   LogMachineIdState(id_state);