Run app_shell on Windows.

extensions/shell/browser/shell_nacl_browser_delegate.cc

Index: extensions/shell/browser/shell_nacl_browser_delegate.cc
diff --git a/extensions/shell/browser/shell_nacl_browser_delegate.cc b/extensions/shell/browser/shell_nacl_browser_delegate.cc
index 778763b0b4b6c14b56a023f23b83bee1ed48ae85..668c3d8a23e47c897590658a002c4eda210d3a81 100644
--- a/extensions/shell/browser/shell_nacl_browser_delegate.cc
+++ b/extensions/shell/browser/shell_nacl_browser_delegate.cc
@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/strings/string_split.h"
@@ -83,7 +84,12 @@ bool ShellNaClBrowserDelegate::DialogsAreSuppressed() {
 
 bool ShellNaClBrowserDelegate::GetCacheDirectory(base::FilePath* cache_dir) {
   // Just use the general cache directory, not a subdirectory like Chrome does.
+#if defined(OS_POSIX)
   return PathService::Get(base::DIR_CACHE, cache_dir);
+#elif defined(OS_WIN)
+  // TODO(yoz): Find an appropriate persistent directory to use here.
+  return PathService::Get(base::DIR_TEMP, cache_dir);
+#endif
 }
 
 bool ShellNaClBrowserDelegate::GetPluginDirectory(base::FilePath* plugin_dir) {