MD Downloads: use "big search" box like MD history

chrome/browser/resources/md_history/app.crisper.js

 // Copyright 2016 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.
 function PromiseResolver() {
   this.resolve_;
   this.reject_;
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
@@ skipping 4393 matching lines @@
 Polymer({
   is: 'cr-toolbar',
   properties: {
     pageName: String,
     searchPrompt: String,
     clearLabel: String,
     menuLabel: String,
     spinnerActive: Boolean,
     showMenu: {
       type: Boolean,
-      reflectToAttribute: true,
-      value: true
+      value: false
     },
     narrow_: {
       type: Boolean,
       reflectToAttribute: true
     },
     showingSearch_: {
       type: Boolean,
       reflectToAttribute: true
     }
   },
@@ skipping 4277 matching lines @@
 
        case HistoryRange.MONTH:
         histogramValue = HistoryPageViewHistogram.GROUPED_MONTH;
         break;
       }
       break;
     }
     md_history.BrowserService.getInstance().recordHistogram('History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END);
   }
 });