[Chromecast] Don't override RegisterCrashKeys() on Android.

chromecast/app/android/cast_crash_reporter_client_android.cc

Index: chromecast/app/android/cast_crash_reporter_client_android.cc
diff --git a/chromecast/app/android/cast_crash_reporter_client_android.cc b/chromecast/app/android/cast_crash_reporter_client_android.cc
index 5bc66ab9e3c192b2f46b77b3e8935aad60dd3d8c..68a533fc580fe18d64eef6c53d7ee4fcf4b197d3 100644
--- a/chromecast/app/android/cast_crash_reporter_client_android.cc
+++ b/chromecast/app/android/cast_crash_reporter_client_android.cc
@@ -69,10 +69,6 @@ bool CastCrashReporterClientAndroid::GetCrashDumpLocation(
                                                               crash_dir);
 }
 
-size_t CastCrashReporterClientAndroid::RegisterCrashKeys() {
-  return crash_keys::RegisterCastCrashKeys();
-}
-
 bool CastCrashReporterClientAndroid::GetCollectStatsConsent() {
   return android::ChromecastConfigAndroid::GetInstance()->CanSendUsageStats();
 }