Prevented default backspace handler in File Browser Gallery

chrome/browser/resources/file_manager/js/image_editor/gallery.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.
 
 /*
  * Base class that Ribbon uses to display photos.
  */
 
 function RibbonClient() {}
 
@@ skipping 554 matching lines @@
 Gallery.prototype.onShare_ = function(event) {
   this.editor_.enterMode(this.shareMode_, event);
   if (this.isSharing_()) {
     this.cancelFading_();
   } else {
     this.initiateFading_();
   }
 };
 
 Gallery.prototype.onKeyDown_ = function(event) {
+  if (event.keyIdentifier == 'U+0008') {  // Backspace.

[SeRya, 2012/03/01 11:04:08]

We should be specific about modification. Otherwise we surprisingly suppress
other keyboard shortcuts including global ones. Have a look at
FileManager.prototype.onKeyDown_.

+    // The default handler would do history.back and close the Gallery.
+    // We do not want that.
+    event.preventDefault();
+    return;
+  }
+
   if (this.isEditing_() && this.editor_.onKeyDown(event))
     return;
 
   switch (event.keyIdentifier) {
     case 'U+001B':  // Escape
       if (this.isEditing_()) {
         this.onEdit_();
       } else if (this.isSharing_()) {
         this.onShare_();
       } else {
@@ skipping 672 matching lines @@
 ShareMode.prototype.setUp = function() {
   ImageEditor.Mode.prototype.setUp.apply(this, arguments);
   ImageUtil.setAttribute(this.menu_, 'hidden', false);
   ImageUtil.setAttribute(this.button_, 'pressed', false);
 };
 
 ShareMode.prototype.cleanUpUI = function() {
   ImageEditor.Mode.prototype.cleanUpUI.apply(this, arguments);
   ImageUtil.setAttribute(this.menu_, 'hidden', true);
 };