refactor gRPC response mappers (#725)

Author: mkolodezny

src/main/java/com/uber/cadence/internal/compatibility/proto/RequestMapper.java

@@ -70,7 +70,6 @@
 import com.uber.cadence.api.v1.QueryWorkflowRequest;
 import com.uber.cadence.api.v1.RecordActivityTaskHeartbeatByIDRequest;
 import com.uber.cadence.api.v1.RecordActivityTaskHeartbeatRequest;
-import com.uber.cadence.api.v1.RefreshWorkflowTasksRequest;
 import com.uber.cadence.api.v1.RegisterDomainRequest;
 import com.uber.cadence.api.v1.RequestCancelWorkflowExecutionRequest;
 import com.uber.cadence.api.v1.ResetStickyTaskListRequest;
@@ -817,15 +816,4 @@ public static ListOpenWorkflowExecutionsRequest listOpenWorkflowExecutionsReques
 
     return request.build();
   }
-
-  public static RefreshWorkflowTasksRequest refreshWorkflowTasksRequest(
-      com.uber.cadence.RefreshWorkflowTasksRequest r) {
-    if (r == null) {
-      return null;
-    }
-    return RefreshWorkflowTasksRequest.newBuilder()
-        .setDomain(r.getDomain())
-        .setWorkflowExecution(workflowExecution(r.getExecution()))
-        .build();
-  }
 }