Compile print_preview, part 1: remove all warnings

chrome/browser/resources/print_preview/previewarea/margin_control.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Draggable control for setting a page margin.
    * @param {!print_preview.ticket_items.CustomMargins.Orientation} orientation
@@ skipping 247 matching lines @@
 
     /** @param {string} value New value of the margin control's textbox. */
     setTextboxValue: function(value) {
       if (this.textbox_.value != value) {
         this.textbox_.value = value;
       }
     },
 
     /**
      * Converts a value in pixels to points.
-     * @param {number} Pixel value to convert.
+     * @param {number} pixels Pixel value to convert.
      * @return {number} Given value expressed in points.
      */
     convertPixelsToPts: function(pixels) {
       var pts;
       var orientationEnum =
           print_preview.ticket_items.CustomMargins.Orientation;
       if (this.orientation_ == orientationEnum.TOP) {
         pts = pixels - this.translateTransform_.y + MarginControl.RADIUS_;
         pts /= this.scaleTransform_;
       } else if (this.orientation_ == orientationEnum.RIGHT) {
@@ skipping 153 matching lines @@
       this.setIsFocused_(false);
       cr.dispatchSimpleEvent(this, MarginControl.EventType.TEXT_CHANGE);
     }
   };
 
   // Export
   return {
     MarginControl: MarginControl
   };
 });