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 6b4df83da34e2b5fe0efaebc5c3dbe254b35063b..9b1193c99f68d8e9c75fce79f1035ec2f8018d35 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1529,6 +1529,11 @@ const char kDownloadDefaultDirectory[] = "download.default_directory";
 // upgrade a unsafe location to a safe location.
 const char kDownloadDirUpgraded[] = "download.directory_upgrade";
 
+#if defined(OS_WIN)
+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";