redo r137692 and r137791 which were speculatively reverted

chrome/browser/chromeos/extensions/file_browser_private_api.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/chromeos/extensions/file_browser_private_api.h"
 
 #include <utility>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 1505 matching lines @@
   SET_STRING(IDS_FILE_BROWSER, SEARCH_EXPAND);
 
   SET_STRING(IDS_FILE_BROWSER, CHANGE_DEFAULT_MENU_ITEM);
   SET_STRING(IDS_FILE_BROWSER, CHANGE_DEFAULT_CAPTION);
   SET_STRING(IDS_FILE_BROWSER, DEFAULT_ACTION_LABEL);
 
   SET_STRING(IDS_FILE_BROWSER, DETAIL_VIEW_TOOLTIP);
   SET_STRING(IDS_FILE_BROWSER, THUMBNAIL_VIEW_TOOLTIP);
 #undef SET_STRING
 
-  dict->SetString("PDF_VIEW_ENABLED",
-      file_manager_util::ShouldBeOpenedWithPdfPlugin(profile(), ".pdf") ?
-          "true" : "false");
+  dict->SetBoolean("PDF_VIEW_ENABLED",
+      file_manager_util::ShouldBeOpenedWithPdfPlugin(profile(), ".pdf"));
 
   ChromeURLDataManager::DataSource::SetFontAndTextDirection(dict);
 
-  if (gdata::util::IsGDataAvailable(profile()))
-    dict->SetString("ENABLE_GDATA", "1");
+  dict->SetBoolean("ENABLE_GDATA", gdata::util::IsGDataAvailable(profile()));
 
 #if defined(USE_ASH)
-    dict->SetString("ASH", "1");
+  dict->SetBoolean("ASH", true);
+#else
+  dict->SetBoolean("ASH", false);
 #endif
 
   return true;
 }
 
 GetGDataFilePropertiesFunction::GetGDataFilePropertiesFunction() {
 }
 
 GetGDataFilePropertiesFunction::~GetGDataFilePropertiesFunction() {
 }
@@ skipping 574 matching lines @@
   else if (active_network->type() == chromeos::TYPE_CELLULAR)
     type_string = "cellular";
   else
     type_string = "ethernet";  // Currently we do not care about other types.
 
   value->SetString("type", type_string);
   result_.reset(value.release());
 
   return true;
 }