Do not show 'No files match "..."' message when GDrive welcome page is shown.

chrome/browser/resources/file_manager/js/file_manager.js

 // 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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 4470 matching lines @@
   };
 
   FileManager.prototype.onSearchBoxUpdate_ = function(event) {
     var searchString = this.document_.getElementById('search-box').value;
     var noResultsDiv = this.document_.getElementById('no-search-results');
 
     function reportEmptySearchResults() {
       if (this.directoryModel_.getFileList().length === 0) {
         var text = strf('SEARCH_NO_MATCHING_FILES', searchString);
         noResultsDiv.innerHTML = text;
-        noResultsDiv.hidden = false;
+        noResultsDiv.setAttribute('show', 'true');
       } else {
-        noResultsDiv.hidden = true;
+        noResultsDiv.removeAttribute('show');
       }
     }
 
     function hideNoResultsDiv() {
-      noResultsDiv.hidden = true;
+      noResultsDiv.removeAttribute('show');
     }
 
     this.directoryModel_.search(searchString,
                                 reportEmptySearchResults.bind(this),
                                 hideNoResultsDiv.bind(this));
   };
 
   FileManager.prototype.decorateSplitter = function(splitterElement) {
     var self = this;
 
@@ skipping 146 matching lines @@
 
     function closeBanner() {
       self.cleanupGDataWelcome_();
       // Stop showing the welcome banner.
       localStorage[WELCOME_HEADER_COUNTER_KEY] = WELCOME_HEADER_COUNTER_LIMIT;
     }
 
     return maybeShowBanner;
   };
 })();