Material PDF: Variety of minor UI bugfixes

chrome/browser/resources/pdf/elements/viewer-toolbar-dropdown/viewer-toolbar-dropdown.js

 // Copyright 2015 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.
 
 (function() {
   /**
    * Size of additional padding in the inner scrollable section of the dropdown.
    */
   var DROPDOWN_INNER_PADDING = 12;
 
   /** Size of vertical padding on the outer #dropdown element. */
   var DROPDOWN_OUTER_PADDING = 2;
 
   /** Minimum height of toolbar dropdowns (px). */
-  var MIN_DROPDOWN_HEIGHT = 300;
+  var MIN_DROPDOWN_HEIGHT = 200;
 
   Polymer({
     is: 'viewer-toolbar-dropdown',
 
     properties: {
       /** String to be displayed at the top of the dropdown. */
       header: String,
 
       /** Icon to display when the dropdown is closed. */
       closedIcon: String,
@@ skipping 105 matching lines @@
 
     animateExit_: function() {
       return this.$.dropdown.animate([
             {transform: 'translateY(0)', opacity: 1},
             {transform: 'translateY(-5px)', opacity: 0}
           ], {duration: 100, easing: 'cubic-bezier(0.4, 0, 1, 1)'});
     }
   });
 
 })();