Add FilePath setter/getter to pref service....

chrome/browser/metrics/metrics_service_uitest.cc

 // Copyright (c) 2006-2008 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.
 
 // Tests the MetricsService stat recording to make sure that the numbers are
 // what we expect.
 
 #include <string>
 
 #include "base/file_util.h"
@@ skipping 29 matching lines @@
     std::wstring page2_path;
     ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &page2_path));
     file_util::AppendToPath(&page2_path, L"iframe.html");
     ASSERT_TRUE(window_->AppendTab(net::FilePathToFileURL(page2_path)));
   }
 
   // Get a PrefService whose contents correspond to the Local State file
   // that was saved by the app as it closed.  The caller takes ownership of the
   // returned PrefService object.
   PrefService* GetLocalState() {
-    std::wstring local_state_path = user_data_dir();
-    file_util::AppendToPath(&local_state_path, chrome::kLocalStateFilename);
+    FilePath local_state_path = FilePath::FromWStringHack(user_data_dir())
+        .Append(chrome::kLocalStateFilename);
 
     PrefService* local_state(new PrefService(local_state_path));
     return local_state;
   }
 
   virtual void TearDown() {
     delete window_;
     UITest::TearDown();
   }
 
@@ skipping 41 matching lines @@
   local_state->RegisterBooleanPref(prefs::kStabilityExitedCleanly, true);
   local_state->RegisterIntegerPref(prefs::kStabilityLaunchCount, 0);
   local_state->RegisterIntegerPref(prefs::kStabilityPageLoadCount, 0);
   local_state->RegisterIntegerPref(prefs::kStabilityRendererCrashCount, 0);
   EXPECT_TRUE(local_state->GetBoolean(prefs::kStabilityExitedCleanly));
   EXPECT_EQ(1, local_state->GetInteger(prefs::kStabilityLaunchCount));
   EXPECT_EQ(3, local_state->GetInteger(prefs::kStabilityPageLoadCount));
   EXPECT_EQ(1, local_state->GetInteger(prefs::kStabilityRendererCrashCount));
 }