[MD settings] adding ClearFrom dropdown menu to ClearBrowsingData

chrome/browser/resources/settings/clear_browsing_data_page/clear_browsing_data_page.js

Index: chrome/browser/resources/settings/clear_browsing_data_page/clear_browsing_data_page.js
diff --git a/chrome/browser/resources/settings/clear_browsing_data_page/clear_browsing_data_page.js b/chrome/browser/resources/settings/clear_browsing_data_page/clear_browsing_data_page.js
index 9102000ea50f854ee8127819ddd21f1038f3d575..a23d39e10882de507a8f093b1ac4e981953a2885 100644
--- a/chrome/browser/resources/settings/clear_browsing_data_page/clear_browsing_data_page.js
+++ b/chrome/browser/resources/settings/clear_browsing_data_page/clear_browsing_data_page.js
@@ -37,5 +37,22 @@ Polymer({
       type: Object,
       notify: true,
     },
+
+    /**
+     * List of options for the dropdown menu.
+     * The order of entries in this array matches the
+     * prefs.browser.clear_data.time_period.value enum.
+     */
+    clearFromOptions_: {
+      readOnly: true,
+      type: Array,
+      value: [
+        loadTimeData.getString('clearDataHour'),
+        loadTimeData.getString('clearDataDay'),
+        loadTimeData.getString('clearDataWeek'),
+        loadTimeData.getString('clearData4Weeks'),
+        loadTimeData.getString('clearDataEverything'),
+      ],
+    },
   },
 });