[pdf] Reset defer_page_unload to original value.

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 0853d79beb294ae9a103eb0e065615401ec53148..3dab6dbcb86f8c95dbcfec97919af478d1bcacb2 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -2470,9 +2470,10 @@ int PDFiumEngine::GetMostVisiblePage() {
   // to defer the page deletion otherwise we could potentially delete the page
   // that originated the calling JS request and destroy the objects that are
   // currently being used.
+  bool old_defer_page_unload = defer_page_unload_;

[Tom Sepez, 2016/12/05 17:54:05]

base::AutoReset maybe?

[dsinclair, 2016/12/05 20:07:48]

Done.

   defer_page_unload_ = true;
   CalculateVisiblePages();
-  defer_page_unload_ = false;
+  defer_page_unload_ = old_defer_page_unload;
   return most_visible_page_;
 }