Support dragging a virtual file out of the browser.

chrome/browser/download/download_exe.cc

Index: chrome/browser/download/download_exe.cc
===================================================================
--- chrome/browser/download/download_exe.cc	(revision 35459)
+++ chrome/browser/download/download_exe.cc	(working copy)
@@ -8,6 +8,7 @@
 #include "chrome/browser/download/download_util.h"
 
 #include "base/logging.h"
+#include "base/string_util.h"
 
 namespace download_util {
 
@@ -158,10 +159,12 @@
 #endif
 };
 
-void InitializeExeTypes(std::set<std::string>* exe_extensions) {
-  DCHECK(exe_extensions);
-  for (size_t i = 0; i < arraysize(g_executables); ++i)
-    exe_extensions->insert(g_executables[i]);
+bool IsExecutableExtension(const std::string& extension) {
+  for (size_t i = 0; i < arraysize(g_executables); ++i) {
+    if (LowerCaseEqualsASCII(extension, g_executables[i]))
+      return true;
+  }
+  return false;
 }
 
 }  // namespace download_util