Use more StringPieces in the PDF plugin.

pdf/out_of_process_instance.h

Index: pdf/out_of_process_instance.h
diff --git a/pdf/out_of_process_instance.h b/pdf/out_of_process_instance.h
index f2435bc69c4ea6f34592e04e61775aea2b0bd2e1..54058a48430efb6e6a953f32158a039bc94d5b81 100644
--- a/pdf/out_of_process_instance.h
+++ b/pdf/out_of_process_instance.h
@@ -204,9 +204,9 @@ class OutOfProcessInstance : public pp::Instance,
   // Process the preview page data information. |src_url| specifies the preview
   // page data location. The |src_url| is in the format:
   // chrome://print/id/page_number/print.pdf
-  // |dst_page_index| specifies the blank page index that needs to be replaced

[Lei Zhang, 2017/05/04 19:19:38]

We might have chosen "dst" because it's the same length as "src" but now I keep
reading it as Daylight Savings Time.

+  // |dest_page_index| specifies the blank page index that needs to be replaced
   // with the new page data.
-  void ProcessPreviewPageInfo(const std::string& src_url, int dst_page_index);
+  void ProcessPreviewPageInfo(const std::string& src_url, int dest_page_index);
   // Load the next available preview page into the blank page.
   void LoadAvailablePreviewPage();