Fix unnecessary boxed primitives in AutoValue classes

Fixes

```
google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/TableResult.java:42: error: [AutoValueUnnecessaryBoxing] property method com.google.cloud.bigquery.TableResult.getTotalRows() is primitive but parameter of setter method is not
    public abstract TableResult.Builder setTotalRows(Long totalRows);
                                        ^
```

See google/auto@328a25c

Author: cushon

google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/TableResult.java

@@ -39,7 +39,7 @@ public abstract static class Builder {
      * Sets the total number of rows in the complete result set, which can be more than the number
      * of rows in the first page of results returned by {@link #getValues()}.
      */
-    public abstract TableResult.Builder setTotalRows(Long totalRows);
+    public abstract TableResult.Builder setTotalRows(long totalRows);
 
     public abstract TableResult.Builder setJobId(JobId jobId);