[Extensions] Migrate ExtensionInstallPrompt::Delegate to be a callback

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/extensions/extension_install_prompt_test_utils.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/path_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "extensions/common/extension.h"
 
 using extensions::Extension;
 
 namespace chrome {
 
-void MockExtensionInstallPromptDelegate::InstallUIProceed() {
-  ++proceed_count_;
-}
-
-void MockExtensionInstallPromptDelegate::InstallUIAbort(bool user_initiated) {
-  ++abort_count_;
-}
-
 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(extension_dir_name)
              .AppendASCII(manifest_file);
@@ skipping 49 matching lines @@
 BuildExtensionPostInstallPermissionsPrompt(Extension* extension) {
   scoped_ptr<ExtensionInstallPrompt::Prompt> prompt(
       new ExtensionInstallPrompt::Prompt(
           ExtensionInstallPrompt::POST_INSTALL_PERMISSIONS_PROMPT));
   prompt->set_extension(extension);
   prompt->set_icon(LoadInstallPromptIcon());
   return prompt.Pass();
 }
 
 }  // namespace chrome