Fix all remaining print preview closure compiler errors

chrome/browser/resources/print_preview/previewarea/margin_control_container.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';
 
   /**
    * UI component used for setting custom print margins.
    * @param {!print_preview.DocumentInfo} documentInfo Document data model.
@@ skipping 90 matching lines @@
      * @private
      */
     this.scaleTransform_ = 1;
 
     /**
      * Clipping size for clipping the margin controls.
      * @type {print_preview.Size}
      * @private
      */
     this.clippingSize_ = null;
-  };
+  }
 
   /**
    * CSS classes used by the custom margins component.
    * @enum {string}
    * @private
    */
   MarginControlContainer.Classes_ = {
     DRAGGING_HORIZONTAL: 'margin-control-container-dragging-horizontal',
     DRAGGING_VERTICAL: 'margin-control-container-dragging-vertical'
   };
@@ skipping 143 matching lines @@
                                  control.getOrientation()),
                              newPosInPts);
       newPosInPts = Math.max(0, newPosInPts);
       newPosInPts = Math.round(newPosInPts);
       control.setPositionInPts(newPosInPts);
       control.setTextboxValue(this.serializeValueFromPts_(newPosInPts));
     },
 
     /**
      * @param {string} value Value to parse to points. E.g. '3.40"' or '200mm'.
-     * @return {number} Value in points represented by the input value.
+     * @return {?number} Value in points represented by the input value.
      * @private
      */
     parseValueToPts_: function(value) {
       // Removing whitespace anywhere in the string.
       value = value.replace(/\s*/g, '');
       if (value.length == 0) {
         return null;
       }
       var validationRegex = new RegExp('^(^-?)(\\d)+(\\' +
           this.measurementSystem_.thousandsDelimeter + '\\d{3})*(\\' +
@@ skipping 78 matching lines @@
         this.draggedControl_ = null;
         this.dragChangedCallback_(false);
       }
     },
 
     /**
      * Called when the mouse moves onto the component. Shows the margin
      * controls.
      * @private
      */
-    onMouseOver_: function() {
+    onMouseOver_: function(event) {
       var fromElement = event.fromElement;
       while (fromElement != null) {
         if (fromElement == this.getElement()) {
           return;
         }
         fromElement = fromElement.parentElement;
       }
       if (this.marginsTypeTicketItem_.isCapabilityAvailable() &&
           this.marginsTypeTicketItem_.getValue() ==
               print_preview.ticket_items.MarginsTypeValue.CUSTOM) {
@@ skipping 86 matching lines @@
         }
       }
     }
   };
 
   // Export
   return {
     MarginControlContainer: MarginControlContainer
   };
 });