Fix crash when user closes window prior to the "Confirm Install" prompt showing

chrome/browser/extensions/extension_install_prompt_unittest.cc

 // Copyright 2014 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.
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_builder.h"
 #include "extensions/common/feature_switch.h"
 #include "extensions/common/permissions/api_permission.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/common/permissions/manifest_permission_set.h"
 #include "extensions/common/permissions/permission_set.h"
 #include "extensions/common/url_pattern_set.h"
 #include "extensions/common/value_builder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 void VerifyPromptPermissionsCallback(
     const base::Closure& quit_closure,
     size_t regular_permissions_count,
     size_t withheld_permissions_count,
-    const ExtensionInstallPrompt::ShowParams& params,
+    ExtensionInstallPromptShowParams* params,
     ExtensionInstallPrompt::Delegate* delegate,
     scoped_refptr<ExtensionInstallPrompt::Prompt> install_prompt) {
   ASSERT_TRUE(install_prompt.get());
   EXPECT_EQ(regular_permissions_count,
             install_prompt->GetPermissionCount(
                 ExtensionInstallPrompt::REGULAR_PERMISSIONS));
   EXPECT_EQ(withheld_permissions_count,
             install_prompt->GetPermissionCount(
                 ExtensionInstallPrompt::WITHHELD_PERMISSIONS));
   quit_closure.Run();
@@ skipping 54 matching lines @@
       NULL,
       extension.get(),
       base::Bind(&VerifyPromptPermissionsCallback,
                  run_loop.QuitClosure(),
                  2u,  // |regular_permissions_count|.
                  1u));  // |withheld_permissions_count|.
   run_loop.Run();
 }
 
 }  // namespace extensions