[mac] Implement a windowed extension install/permissions prompt.

chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.mm

Index: chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.mm
diff --git a/chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.mm b/chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.mm
index 9ecc729077c00f0bad035c39b3e9f38888749ad3..3a869aa35913be7f346e2c2fd3b7f2b2e395bcda 100644
--- a/chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.mm
+++ b/chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.mm
@@ -23,14 +23,16 @@ void MockExtensionInstallPromptDelegate::InstallUIAbort(bool user_initiated) {
   ++abort_count_;
 }
 
-scoped_refptr<Extension> LoadInstallPromptExtension() {
+scoped_refptr<extensions::Extension> LoadInstallPromptExtension(
+    const char* extension_dir_name,
+    const char* manifest_file) {
   scoped_refptr<Extension> extension;
 
   base::FilePath path;
   PathService::Get(chrome::DIR_TEST_DATA, &path);
   path = path.AppendASCII("extensions")
-             .AppendASCII("install_prompt")
-             .AppendASCII("extension.json");
+             .AppendASCII(extension_dir_name)
+             .AppendASCII(manifest_file);
 
   std::string error;
   JSONFileValueSerializer serializer(path);
@@ -50,6 +52,10 @@ scoped_refptr<Extension> LoadInstallPromptExtension() {
   return extension;
 }
 
+scoped_refptr<Extension> LoadInstallPromptExtension() {
+  return LoadInstallPromptExtension("install_prompt", "extension.json");
+}
+
 gfx::Image LoadInstallPromptIcon() {
   base::FilePath path;
   PathService::Get(chrome::DIR_TEST_DATA, &path);