Remove DNS event reporting level

Reporting level was used only by microbenchmarks, but CI go/apct-net
doesn't show a significant timing difference between test runs with and
without reporting enabled.

Test: atest resolv_integration_test
Test: m netd_benchmark && adb sync data && adb shell /data/benchmarktest64/netd_benchmark/netd_benchmark
Change-Id: I0db0522e1cf229649c2516973d8942549ccd5476
diff --git a/server/EventReporter.h b/server/EventReporter.h
index 3338a04..d4dc93d 100644
--- a/server/EventReporter.h
+++ b/server/EventReporter.h
@@ -24,20 +24,15 @@
 #include "android/net/metrics/INetdEventListener.h"
 
 /*
- * This class stores the reporting level and can be used to get the event listener service.
+ * This class can be used to get the event listener service.
  */
 class EventReporter {
 public:
-    int setMetricsReportingLevel(const int level);
-    int getMetricsReportingLevel() const;
-
     // Returns the binder reference to the netd events listener service, attempting to fetch it if
     // we do not have it already. This method is threadsafe.
     android::sp<android::net::metrics::INetdEventListener> getNetdEventListener();
 
 private:
-    std::atomic_int mReportingLevel{
-            android::net::metrics::INetdEventListener::REPORTING_LEVEL_FULL};
     // TODO: consider changing this into an atomic type such as
     // std::atomic<android::net::metrics::INetdEventListener> and deleting the mutex.
     //