Get rid of FilePath::FromWStringHack from google_chrome_distribution.[cc,h].

chrome/installer/util/google_chrome_distribution_dummy.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 //
 // This file defines dummy implementation of several functions from the
 // BrowserDistribution class for Google Chrome. These functions allow 64-bit
 // Windows Chrome binary to build successfully. Since this binary is only used
 // for Native Client support, most of the install/uninstall functionality is not
 // necessary there.
 
 #include "chrome/installer/util/google_chrome_distribution.h"
 
 #include <windows.h>
 
+#include "base/file_path.h"
 #include "base/logging.h"
 
 GoogleChromeDistribution::GoogleChromeDistribution(
     const installer::MasterPreferences& prefs)
         : BrowserDistribution(prefs) {
 }
 
 void GoogleChromeDistribution::DoPostUninstallOperations(
     const Version& version,
     const FilePath& local_data_path,
@@ skipping 86 matching lines @@
     const installer::Product& installation, bool system_level) {
   NOTREACHED();
 }
 
 void GoogleChromeDistribution::InactiveUserToastExperiment(int flavor,
     const installer::Product& installation) {
   NOTREACHED();
 }
 
 bool GoogleChromeDistribution::ExtractUninstallMetricsFromFile(
-    const std::wstring& file_path, std::wstring* uninstall_metrics_string) {
+    const FilePath& file_path, std::wstring* uninstall_metrics_string) {
   NOTREACHED();
   return false;
 }
 
 bool GoogleChromeDistribution::ExtractUninstallMetrics(
     const DictionaryValue& root, std::wstring* uninstall_metrics_string) {
   NOTREACHED();
   return false;
 }
 
 bool GoogleChromeDistribution::BuildUninstallMetricsString(
     DictionaryValue* uninstall_metrics_dict, std::wstring* metrics) {
   NOTREACHED();
   return false;
 }
 
 bool GoogleChromeDistribution::SetChannelFlags(
     bool set,
     installer::ChannelInfo* channel_info) {
   NOTREACHED();
   return false;
 }