Windows: Add an "Open in Adobe Reader" menu item for PDF files in the download shelf.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 0b486774631a1da8834bd71a2012d2e54d47f6a9..470972de517b1e4f79903de49771d35ff1f50d8e 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1509,6 +1509,12 @@ const char kDownloadDefaultDirectory[] = "download.default_directory";
 // upgrade a unsafe location to a safe location.
 const char kDownloadDirUpgraded[] = "download.directory_upgrade";
 
+#if defined(OS_WIN)
+// Whether downloaded PDFs should be opened in Adobe Acrobat Reader.
+const char kOpenPdfDownloadInAdobeReader[] =
+    "download.open_pdf_in_adobe_reader";
+#endif
+
 // String which specifies where to save html files to by default.
 const char kSaveFileDefaultDirectory[] = "savefile.default_directory";