Apply the namespace migration for "selectfile.last_directory" user-pref as well.

chrome/browser/chromeos/preferences.cc

Index: chrome/browser/chromeos/preferences.cc
diff --git a/chrome/browser/chromeos/preferences.cc b/chrome/browser/chromeos/preferences.cc
index 791b79ca318851866acb2d7fbda9992093ab01b7..4f40880544aca37365b2c57aced7f3a73664f875 100644
--- a/chrome/browser/chromeos/preferences.cc
+++ b/chrome/browser/chromeos/preferences.cc
@@ -368,6 +368,8 @@ void Preferences::InitUserPrefs(PrefServiceSyncable* prefs) {
                                    prefs, callback);
   download_default_directory_.Init(prefs::kDownloadDefaultDirectory,
                                    prefs, callback);
+  select_file_last_directory_.Init(prefs::kSelectFileLastDirectory,
+                                   prefs, callback);
   primary_mouse_button_right_.Init(prefs::kPrimaryMouseButtonRight,
                                    prefs, callback);
   preferred_languages_.Init(prefs::kLanguagePreferredLanguages,
@@ -581,6 +583,7 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   }
   if (!pref_name || *pref_name == prefs::kDownloadDefaultDirectory) {
     const base::FilePath pref_path = download_default_directory_.GetValue();
+    // TODO(haruki): Remove this when migration completes. crbug.com/229304.
     if (drive::util::NeedsNamespaceMigration(pref_path)) {
       prefs_->SetFilePath(prefs::kDownloadDefaultDirectory,
                           drive::util::ConvertToMyDriveNamespace(pref_path));
@@ -597,6 +600,16 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
           "FileBrowser.DownloadDestination.IsGoogleDrive.Started",
           default_download_to_drive);
   }
+  if (!pref_name || *pref_name == prefs::kSelectFileLastDirectory) {
+    const base::FilePath pref_path = select_file_last_directory_.GetValue();
+    // This pref can contain a Drive path, which needs to be updated due to
+    // namespaces introduced by crbug.com/174233.
+    // TODO(haruki): Remove this when migration completes. crbug.com/229304.
+    if (drive::util::NeedsNamespaceMigration(pref_path)) {
+      prefs_->SetFilePath(prefs::kSelectFileLastDirectory,
+                          drive::util::ConvertToMyDriveNamespace(pref_path));
+    }
+  }
 
   if (!pref_name || *pref_name == prefs::kLanguagePreferredLanguages) {
     // Unlike kLanguagePreloadEngines and some other input method