PDF: Use FPDFAction_GetFilePath() to handle launch actions.

pdf/pdfium/pdfium_page.h

Index: pdf/pdfium/pdfium_page.h
diff --git a/pdf/pdfium/pdfium_page.h b/pdf/pdfium/pdfium_page.h
index 28249c852145b0c7523c4e7bc4b24848a747677f..0490ff8fc01022668b5dc989a6adf7965fcf84f3 100644
--- a/pdf/pdfium/pdfium_page.h
+++ b/pdf/pdfium/pdfium_page.h
@@ -121,6 +121,8 @@ class PDFiumPage {
   Area GetDestinationTarget(FPDF_DEST destination, LinkTarget* target) const;
   // Returns target associated with a URI action.
   Area GetURITarget(FPDF_ACTION uri_action, LinkTarget* target) const;
+  // Returns target associated with a launch action.
+  Area GetLaunchTarget(FPDF_ACTION launch_action, LinkTarget* target) const;
 
   class ScopedLoadCounter {
    public: