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

chrome/installer/util/google_chrome_distribution.h

Index: chrome/installer/util/google_chrome_distribution.h
diff --git a/chrome/installer/util/google_chrome_distribution.h b/chrome/installer/util/google_chrome_distribution.h
index f4feb6e2c1f7b7ccaebebde16a6006ab8e938461..038d27bfc3280002d19238ac63c624bca7b07bac 100644
--- a/chrome/installer/util/google_chrome_distribution.h
+++ b/chrome/installer/util/google_chrome_distribution.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2009 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.
 //
@@ -16,6 +16,7 @@
 #include "chrome/installer/util/util_constants.h"
 
 class DictionaryValue;
+class FilePath;
 
 class GoogleChromeDistribution : public BrowserDistribution {
  public:
@@ -102,11 +103,11 @@ class GoogleChromeDistribution : public BrowserDistribution {
   // Returns true if uninstall_metrics has been successfully populated with
   // the uninstall metrics, false otherwise.
   virtual bool ExtractUninstallMetricsFromFile(
-      const std::wstring& file_path, std::wstring* uninstall_metrics);
+      const FilePath& file_path, std::wstring* uninstall_metrics);
 
   // Extracts uninstall metrics from the given JSON value.
   virtual bool ExtractUninstallMetrics(const DictionaryValue& root,
-      std::wstring* uninstall_metrics);
+                                       std::wstring* uninstall_metrics);
 
   // Given a DictionaryValue containing a set of uninstall metrics,
   // this builds a URL parameter list of all the contained metrics.