Material PDF: Variety of minor UI bugfixes

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

Index: chrome/browser/resources/pdf/elements/viewer-bookmark/viewer-bookmark.css
diff --git a/chrome/browser/resources/pdf/elements/viewer-bookmark/viewer-bookmark.css b/chrome/browser/resources/pdf/elements/viewer-bookmark/viewer-bookmark.css
index 9e73b1349470498d3b3c6fe15fe98235ea04956d..c723c370ae4916d79bcc0e51bc5ff9d88a2d93d4 100644
--- a/chrome/browser/resources/pdf/elements/viewer-bookmark/viewer-bookmark.css
+++ b/chrome/browser/resources/pdf/elements/viewer-bookmark/viewer-bookmark.css
@@ -9,9 +9,7 @@
   cursor: pointer;
   font-size: 77.8%;
   height: 30px;
-  overflow: hidden;
   position: relative;
-  white-space: nowrap;
 }
 
 #item:hover {
@@ -19,6 +17,12 @@
   color: rgb(20, 20, 20);
 }
 
+#title {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 #expand {
   --iron-icon-height: 16px;
   --iron-icon-width: 16px;