Remove util.platform from Files app.

ui/file_manager/gallery/js/slide_mode.js

 // Copyright 2014 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.
 
 'use strict';
 
 /**
  * Slide mode displays a single image and has a set of controls to navigate
  * between the images and to edit an image.
  *
@@ skipping 110 matching lines @@
   this.savedLabel_ = util.createChild(this.options_, 'saved');
   this.savedLabel_.textContent = this.displayStringFunction_('GALLERY_SAVED');
 
   var overwriteOriginalBox =
       util.createChild(this.options_, 'overwrite-original');
 
   this.overwriteOriginal_ = util.createChild(
       overwriteOriginalBox, '', 'input');
   this.overwriteOriginal_.type = 'checkbox';
   this.overwriteOriginal_.id = 'overwrite-checkbox';
-  util.platform.getPreference(SlideMode.OVERWRITE_KEY, function(value) {
+  chrome.storage.local.get([SlideMode.OVERWRITE_KEY], function(values) {

[hirono, 2014/09/10 13:03:40]

We can pass a single key as a string.

+    var value = values[SlideMode.OVERWRITE_KEY];
     // Out-of-the box default is 'true'
     this.overwriteOriginal_.checked =
-        (typeof value !== 'string' || value === 'true');
+        (value === undefined || value) ? true : false;

[hirono, 2014/09/10 13:03:40]

It looks the value can be 'false'. Could you double check?

[mtomasz, 2014/09/11 03:30:50]

Done.

   }.bind(this));
   this.overwriteOriginal_.addEventListener('click',
       this.onOverwriteOriginalClick_.bind(this));
 
   var overwriteLabel = util.createChild(overwriteOriginalBox, '', 'label');
   overwriteLabel.textContent =
       this.displayStringFunction_('GALLERY_OVERWRITE_ORIGINAL');
   overwriteLabel.setAttribute('for', 'overwrite-checkbox');
 
   this.bubble_ = util.createChild(this.toolbar_, 'bubble');
@@ skipping 577 matching lines @@
       this.printButton_.setAttribute('disabled', '');
     } else {
       this.editButton_.removeAttribute('disabled');
       this.printButton_.removeAttribute('disabled');
     }
 
     // For once edited image, disallow the 'overwrite' setting change.
     ImageUtil.setAttribute(this.options_, 'saved',
         !this.getSelectedItem().isOriginal());
 
-    util.platform.getPreference(SlideMode.OVERWRITE_BUBBLE_KEY,
-        function(value) {
-          var times = typeof value === 'string' ? parseInt(value, 10) : 0;
+    chrome.storage.local.get([SlideMode.OVERWRITE_BUBBLE_KEY],

[hirono, 2014/09/10 13:03:40]

We can pass a single key as a string.

[mtomasz, 2014/09/11 03:30:50]

Done.

+        function(values) {
+          var times = values[SlideMode.OVERWRITE_BUBBLE_KEY] || 0;
           if (times < SlideMode.OVERWRITE_BUBBLE_MAX_TIMES) {
             this.bubble_.hidden = false;
             if (this.isEditing()) {
-              util.platform.setPreference(
-                  SlideMode.OVERWRITE_BUBBLE_KEY, times + 1);
+              var items = {};
+              items[SlideMode.OVERWRITE_BUBBLE_KEY] = times + 1;
+              chrome.storage.local.set(items);
             }
           }
         }.bind(this));
 
     loadCallback(loadType, delay);
   }.bind(this);
 
   var displayDone = function() {
     cr.dispatchSimpleEvent(this, 'image-displayed');
     displayCallback();
@@ skipping 283 matching lines @@
 SlideMode.prototype.shouldOverwriteOriginal_ = function() {
    return this.overwriteOriginal_.checked;
 };
 
 /**
  * 'Overwrite original' checkbox handler.
  * @param {Event} event Event.
  * @private
  */
 SlideMode.prototype.onOverwriteOriginalClick_ = function(event) {
-  util.platform.setPreference(SlideMode.OVERWRITE_KEY, event.target.checked);
+  var items = {};
+  items[SlideMode.OVERWRITE_KEY] = event.target.checked;
+  chrome.storage.local.set(items);
 };
 
 /**
  * Overwrite info bubble close handler.
  * @private
  */
 SlideMode.prototype.onCloseBubble_ = function() {
   this.bubble_.hidden = true;
-  util.platform.setPreference(SlideMode.OVERWRITE_BUBBLE_KEY,
-      SlideMode.OVERWRITE_BUBBLE_MAX_TIMES);
+  var items = {};
+  items[SlideMode.OVERWRITE_BUBBLE_KEY] =
+      SlideMode.OVERWRITE_BUBBLE_MAX_TIMES;
+  chrome.storage.local.set(items);
 };
 
 // Slideshow
 
 /**
  * Slideshow interval in ms.
  */
 SlideMode.SLIDESHOW_INTERVAL = 5000;
 
 /**
@@ skipping 502 matching lines @@
 TouchHandler.prototype.onMouseWheel_ = function(event) {
   var viewport = this.slideMode_.getViewport();
   if (!this.enabled_ || !viewport.isZoomed())
     return;
   this.stopOperation();
   viewport.setOffset(
       viewport.getOffsetX() + event.wheelDeltaX,
       viewport.getOffsetY() + event.wheelDeltaY);
   this.slideMode_.applyViewportChange();
 };