fix: minor changes

Author: AgraVator

core/src/main/java/io/grpc/internal/DelayedClientTransport.java

@@ -37,6 +37,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.LinkedHashSet;
+import java.util.Objects;
 import java.util.concurrent.Executor;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -381,7 +382,7 @@ private PendingStream(PickSubchannelArgs args, ClientStreamTracer[] tracers,
     }
 
     void updateDelayReason(String newToken) {
-      if (!java.util.Objects.equals(delayReasonToken, newToken)) {
+      if (!Objects.equals(delayReasonToken, newToken)) {
         if (delayReasonToken != null) {
           for (ClientStreamTracer tracer : tracers) {
             tracer.delayEnded();

xds/src/main/java/io/grpc/xds/PriorityLoadBalancer.java

@@ -367,8 +367,8 @@ private static final class PriorityPicker extends SubchannelPicker {
     private final String priority;
 
     PriorityPicker(SubchannelPicker delegate, String priority) {
-      this.delegate = com.google.common.base.Preconditions.checkNotNull(delegate, "delegate");
-      this.priority = com.google.common.base.Preconditions.checkNotNull(priority, "priority");
+      this.delegate = checkNotNull(delegate, "delegate");
+      this.priority = checkNotNull(priority, "priority");
     }
 
     @Override
@@ -395,7 +395,7 @@ public boolean equals(Object o) {
 
     @Override
     public int hashCode() {
-      return java.util.Objects.hash(delegate, priority);
+      return Objects.hash(delegate, priority);
     }
   }
 }

xds/src/test/java/io/grpc/xds/RingHashLoadBalancerTest.java

@@ -1164,7 +1164,6 @@ public void tfWithReadyChild_doesNotTriggerIdleChildConnection() {
     assertThat(connectionRequestedQueue.poll()).isNull();
   }
 
-
   private List<Subchannel> initializeLbSubchannels(RingHashConfig config,
       List<EquivalentAddressGroup> servers, InitializationFlags... initFlags) {