Make PDFs return find replies in the same form as regular pages.

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 3e8f5b4971c7882edaeda36a2909ca6df1915483..b32834646496319a32907f4aaa36fd0d99a53137 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -2299,6 +2299,7 @@ bool PDFiumEngine::SelectFindResult(bool forward) {
   }
 
   client_->NotifySelectedFindResultChanged(current_find_index_.GetIndex());
+  client_->NotifyNumberOfFindResultsChanged(find_results_.size(), true);
   return true;
 }