chore: Update generated tests

Author: lqiu96

gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientTestClassComposer.java

@@ -60,7 +60,6 @@
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
 import com.google.longrunning.Operation;
-import com.google.protobuf.AbstractMessage;
 import com.google.protobuf.Any;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -902,7 +901,7 @@ protected abstract List<Statement> createRpcLroExceptionTestCatchBody(
   private static TypeStore createStaticTypes() {
     List<Class<?>> concreteClazzes =
         Arrays.asList(
-            AbstractMessage.class,
+            com.google.protobuf.Message.class,
             After.class,
             AfterClass.class,
             Any.class,

gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposer.java

@@ -53,7 +53,6 @@
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.utils.JavaStyle;
 import com.google.common.base.Preconditions;
-import com.google.protobuf.AbstractMessage;
 import io.grpc.StatusRuntimeException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -378,7 +377,7 @@ protected List<Statement> constructRpcTestCheckerLogic(
                         ConcreteReference.builder()
                             .setClazz(List.class)
                             .setGenerics(
-                                Arrays.asList(ConcreteReference.withClazz(AbstractMessage.class)))
+                                Arrays.asList(ConcreteReference.withClazz(com.google.protobuf.Message.class)))
                             .build()))
                 .setName("actualRequests")
                 .build());
@@ -416,7 +415,7 @@ protected List<Statement> constructRpcTestCheckerLogic(
             .setArguments(
                 ValueExpr.withValue(
                     PrimitiveValue.builder().setType(TypeNode.INT).setValue("0").build()))
-            .setReturnType(FIXED_TYPESTORE.get("AbstractMessage"))
+            .setReturnType(FIXED_TYPESTORE.get("Message"))
             .build();
     getFirstRequestExpr =
         CastExpr.builder().setType(method.inputType()).setExpr(getFirstRequestExpr).build();