Refactor Material Design PDF Viewer toolbar into a single element

chrome/browser/resources/pdf/index-material.css

Index: chrome/browser/resources/pdf/index-material.css
diff --git a/chrome/browser/resources/pdf/index-material.css b/chrome/browser/resources/pdf/index-material.css
index 84779ef1819aaec41bd5e7d239c065a4425607f6..5d2d28eb41525281685190aa75d2dd21973c3fe9 100644
--- a/chrome/browser/resources/pdf/index-material.css
+++ b/chrome/browser/resources/pdf/index-material.css
@@ -16,35 +16,12 @@ body {
   margin: 0;
 }
 
-core-toolbar {
-  background-color: transparent;
-  color: rgb(241, 241, 241);
-  font-size: 2em;
-  height: 64px;
-  z-index: 3;
-}
-
-#toolbar-shadow {
+viewer-pdf-toolbar {
   position: fixed;
   width: 100%;
   z-index: 4;
 }
 
-#progress-bar {
-  height: 64px;
-  position: absolute;
-  width: 100%;
-  z-index: 3;
-}
-
-paper-progress::shadow #activeProgress {
-  background-color: rgb(33, 150, 243);
-}
-
-paper-progress::shadow #progressContainer {
-  background-color: rgb(100, 181, 246);
-}
-
 #plugin {
   position: fixed;
   top: 64px;