Update colors of material design PDF viewer.

chrome/browser/resources/pdf/elements/viewer-pdf-toolbar/viewer-pdf-toolbar.css

 /* 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. */
 
 /* We introduce a wrapper animatable element and set the overflow since
  * core-transition interferes with the box-shadow from paper-shadow. */
 #animatable {
   overflow: visible;
 }
 
 /* We introduce a wrapper aligner element as setting the relevant attributes
  * (horizontal justified layout center) have no effect on the core-toolbar. */
 #aligner {
   width: 100%;
 }
 
 paper-progress {
   height: 56px;
   position: absolute;
   width: 100%;
   z-index: 3;
 }
 
 paper-progress::shadow #activeProgress {
-  background-color: rgb(33, 150, 243);
+  background-color: rgb(27, 168, 243);
 }
 
 paper-progress::shadow #progressContainer {
   background-color: rgb(100, 181, 246);
 }
 
 core-toolbar {
   background-color: transparent;
   color: rgb(241, 241, 241);
   font-size: 1.5em;
   height: 56px;
   padding-left: 1em;
   padding-right: 1em;
   z-index: 3;
 }
 
 core-toolbar /deep/ ::selection {
   background: rgb(187, 222, 251);
 }
 
 .invisible {
   visibility: hidden;
 }