Avoid using wildcards in imports. (#3675)

Author: visumickey

firebase-perf/src/main/java/com/google/firebase/perf/FirebasePerformance.java

@@ -14,7 +14,7 @@
 
 package com.google.firebase.perf;
 
-import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.*;
+import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.validateAttribute;
 
 import android.content.Context;
 import android.content.pm.ApplicationInfo;

firebase-perf/src/main/java/com/google/firebase/perf/metrics/HttpMetric.java

@@ -14,7 +14,7 @@
 
 package com.google.firebase.perf.metrics;
 
-import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.*;
+import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.validateAttribute;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;

firebase-perf/src/main/java/com/google/firebase/perf/metrics/Trace.java

@@ -14,7 +14,9 @@
 
 package com.google.firebase.perf.metrics;
 
-import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.*;
+import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.validateAttribute;
+import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.validateMetricName;
+import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.validateTraceName;
 
 import android.os.Parcel;
 import android.os.Parcelable;

firebase-perf/src/main/java/com/google/firebase/perf/metrics/validator/FirebasePerfTraceValidator.java

@@ -14,7 +14,7 @@
 
 package com.google.firebase.perf.metrics.validator;
 
-import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.*;
+import static com.google.firebase.perf.metrics.validator.PerfMetricValidator.validateAttribute;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;