add setter for allowed hard bound token types to only the GRPC channel provider.

Author: rmehta19

gax-java/gax-grpc/src/main/java/com/google/api/gax/grpc/InstantiatingGrpcChannelProvider.java

@@ -228,7 +228,6 @@ public TransportChannelProvider withEndpoint(String endpoint) {
     return toBuilder().setEndpoint(endpoint).build();
   }
 
-  @Override
   public TransportChannelProvider setAllowHardBoundTokens(ArrayList<String> allowedValues) {
     return toBuilder().setAllowHardBoundTokenTypes(allowedValues).build();
   }

gax-java/gax-grpc/src/test/java/com/google/api/gax/grpc/testing/LocalChannelProvider.java

@@ -47,7 +47,6 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.inprocess.InProcessChannelBuilder;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CopyOnWriteArrayList;
@@ -107,12 +106,6 @@ public TransportChannelProvider withEndpoint(String endpoint) {
     throw new UnsupportedOperationException("LocalChannelProvider doesn't need an endpoint");
   }
 
-  @Override
-  public TransportChannelProvider setAllowHardBoundTokens(ArrayList<String> allowedValues) {
-    throw new UnsupportedOperationException(
-        "LocalChannelProvider doesn't support hard-bound tokens");
-  }
-
   @Override
   @BetaApi("The surface for customizing pool size is not stable yet and may change in the future.")
   public boolean acceptsPoolSize() {

gax-java/gax-httpjson/src/main/java/com/google/api/gax/httpjson/InstantiatingHttpJsonChannelProvider.java

@@ -42,7 +42,6 @@
 import java.io.IOException;
 import java.security.GeneralSecurityException;
 import java.security.KeyStore;
-import java.util.ArrayList;
 import java.util.Map;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
@@ -140,12 +139,6 @@ public TransportChannelProvider withPoolSize(int size) {
         "InstantiatingHttpJsonChannelProvider doesn't allow pool size customization");
   }
 
-  @Override
-  public TransportChannelProvider setAllowHardBoundTokens(ArrayList<String> allowedValues) {
-    throw new UnsupportedOperationException(
-        "InstantiatingHttpJsonChannelProvider doesn't support hard-bound tokens");
-  }
-
   @Override
   public String getTransportName() {
     return HttpJsonTransportChannel.getHttpJsonTransportName();

gax-java/gax/src/main/java/com/google/api/gax/rpc/FixedTransportChannelProvider.java

@@ -33,7 +33,6 @@
 import com.google.auth.Credentials;
 import com.google.common.base.Preconditions;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.Map;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
@@ -69,12 +68,6 @@ public FixedTransportChannelProvider withExecutor(Executor executor) {
         "FixedTransportChannelProvider doesn't need an executor");
   }
 
-  @Override
-  public TransportChannelProvider setAllowHardBoundTokens(ArrayList<String> allowedValues) {
-    throw new UnsupportedOperationException(
-        "FixedTransportChannelProvider doesn't support hard-bound tokens");
-  }
-
   @Override
   public boolean needsHeaders() {
     return false;

gax-java/gax/src/main/java/com/google/api/gax/rpc/TransportChannelProvider.java

@@ -33,7 +33,6 @@
 import com.google.api.core.InternalExtensionOnly;
 import com.google.auth.Credentials;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.Map;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
@@ -98,9 +97,6 @@ public interface TransportChannelProvider {
    */
   TransportChannelProvider withEndpoint(String endpoint);
 
-  /** Sets the allowed hard bound token types. */
-  TransportChannelProvider setAllowHardBoundTokens(ArrayList<String> allowedValues);
-
   /**
    * Reports whether this provider allows pool size customization.
    *

gax-java/gax/src/test/java/com/google/api/gax/rpc/ClientContextTest.java

@@ -63,7 +63,6 @@
 import com.google.common.truth.Truth;
 import java.io.IOException;
 import java.net.URI;
-import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -201,17 +200,6 @@ public boolean acceptsPoolSize() {
       return false;
     }
 
-    @Override
-    public TransportChannelProvider setAllowHardBoundTokens(ArrayList<String> allowedValues) {
-      return new FakeTransportProvider(
-          this.transport,
-          this.executor,
-          this.shouldAutoClose,
-          this.headers,
-          this.credentials,
-          this.endpoint);
-    }
-
     @Override
     public TransportChannelProvider withPoolSize(int size) {
       throw new UnsupportedOperationException(