Use UintToString() to convert uint32 to string

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index ae3fb3e3b51d30593b803967cb2cbea9c34626dd..5f1eec6b62d4df63183dc1f0da9469c79aad7d00 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -1580,12 +1580,12 @@ pp::Buffer_Dev PDFiumEngine::PrintPagesAsPDF(
     if (!page_number_str.empty())
       page_number_str.append(",");
     page_number_str.append(
-        base::IntToString(page_ranges[index].first_page_number + 1));
+        base::UintToString(page_ranges[index].first_page_number + 1));
     if (page_ranges[index].first_page_number !=
             page_ranges[index].last_page_number) {
       page_number_str.append("-");
       page_number_str.append(
-          base::IntToString(page_ranges[index].last_page_number + 1));
+          base::UintToString(page_ranges[index].last_page_number + 1));
     }
   }