Avoid some pref writes in MetricsLog. Ensure some stability metrics are cleared.

components/metrics/metrics_service.cc

Index: components/metrics/metrics_service.cc
diff --git a/components/metrics/metrics_service.cc b/components/metrics/metrics_service.cc
index 2c6b8ef0a2465233e695fcf8420dda38c2067e36..df9bd1b95522395267fb47353a652cfee6baefcb 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -523,7 +523,11 @@ void MetricsService::ClearSavedStabilityMetrics() {
     provider->ClearSavedStabilityMetrics();
 
   // Reset the prefs that are managed by MetricsService/MetricsLog directly.
+  local_state_->SetInteger(prefs::kStabilityBreakpadRegistrationSuccess, 0);
+  local_state_->SetInteger(prefs::kStabilityBreakpadRegistrationFail, 0);
   local_state_->SetInteger(prefs::kStabilityCrashCount, 0);
+  local_state_->SetInteger(prefs::kStabilityDebuggerPresent, 0);
+  local_state_->SetInteger(prefs::kStabilityDebuggerNotPresent, 0);
   local_state_->SetInteger(prefs::kStabilityExecutionPhase,
                            UNINITIALIZED_PHASE);
   local_state_->SetInteger(prefs::kStabilityIncompleteSessionEndCount, 0);