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 e9b12c62945cea1d6d5e53bdc128f0b9f521dbdb..cc1c0cf2a6428a24077e193890dbd38f6985050f 100644
--- a/chrome/browser/resources/pdf/index-material.css
+++ b/chrome/browser/resources/pdf/index-material.css
@@ -16,37 +16,12 @@ body {
   margin: 0;
 }
 
-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;
-}
-
-#toolbar-shadow {
+viewer-pdf-toolbar {
   position: fixed;
   width: 100%;
   z-index: 4;
 }
 
-#progress-bar {
-  height: 56px;
-  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: 56px;