remove unnecessary changes

Author: jinseopkim0

java-bigtable/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/admin/v2/BigtableInstanceAdminClient.java

@@ -148,7 +148,7 @@ private BigtableInstanceAdminClient(
       @Nonnull String projectId, @Nonnull BigtableInstanceAdminStub stub) {
     this.projectId = projectId;
     this.stub = stub;
-    this.baseClient = BigtableInstanceAdminClientV2.create(stub);
+    this.baseClient = new BigtableInstanceAdminClientV2(stub);
   }
 
   /** Gets the project ID this client is associated with. */

java-bigtable/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/admin/v2/BigtableInstanceAdminClientV2.java

@@ -40,9 +40,4 @@ public static final BigtableInstanceAdminClientV2 create(
       BaseBigtableInstanceAdminSettings settings) throws IOException {
     return new BigtableInstanceAdminClientV2(settings);
   }
-
-  /** Constructs an instance of BigtableInstanceAdminClientV2 with the given stub. */
-  public static final BigtableInstanceAdminClientV2 create(BigtableInstanceAdminStub stub) {
-    return new BigtableInstanceAdminClientV2(stub);
-  }
 }