PDF: Split elements shared between material and non-material PDF viewers

chrome/browser/resources/pdf/index.css

Index: chrome/browser/resources/pdf/index.css
diff --git a/chrome/browser/resources/pdf/index.css b/chrome/browser/resources/pdf/index.css
index 06ca8fc2c1208068d6726c83b246236707f20087..36db509ab3e78767e3e02f9755f1f6018029ed24 100644
--- a/chrome/browser/resources/pdf/index.css
+++ b/chrome/browser/resources/pdf/index.css
@@ -23,12 +23,12 @@ viewer-progress-bar {
   z-index: 3;
 }
 
-viewer-error-screen {
+viewer-error-screen-legacy {
   visibility: hidden;
   z-index: 2;
 }
 
-viewer-password-screen {
+viewer-password-screen-legacy {
   visibility: hidden;
   z-index: 2;
 }