Simplify directory initialization in Files app.

chrome/browser/ui/views/select_file_dialog_extension_browsertest.cc

 // 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.
 
 #include "chrome/browser/ui/views/select_file_dialog_extension.h"
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
+#include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 #include "chrome/browser/chromeos/file_manager/path_util.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/test/test_utils.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #include "ui/shell_dialogs/selected_file_info.h"
 
 using content::BrowserContext;
 
 // Mock listener used by test below.
@@ skipping 74 matching lines @@
     listener_.reset();
 
     second_dialog_ = NULL;
     second_listener_.reset();
   }
 
   // Creates a file system mount point for a directory.
   void AddMountPoint(const base::FilePath& path) {
     EXPECT_TRUE(file_manager::util::RegisterDownloadsMountPoint(
         browser()->profile(), path));
+    browser()->profile()->GetPrefs()->SetFilePath(
+        prefs::kDownloadDefaultDirectory, downloads_dir_);
   }
 
   void CheckJavascriptErrors() {
     content::RenderViewHost* host = dialog_->GetRenderViewHost();
     scoped_ptr<base::Value> value =
         content::ExecuteScriptAndGetValue(host, "window.JSErrorCount");
     int js_error_count = 0;
     ASSERT_TRUE(value->GetAsInteger(&js_error_count));
     ASSERT_EQ(0, js_error_count);
   }
@@ skipping 229 matching lines @@
   ASSERT_FALSE(second_dialog_->IsRunning(owning_window));
 
   // Click cancel button.
   CloseDialog(DIALOG_BTN_CANCEL, owning_window);
 
   // Listener should have been informed of the cancellation.
   ASSERT_FALSE(listener_->file_selected());
   ASSERT_TRUE(listener_->canceled());
   ASSERT_EQ(this, listener_->params());
 }