MD Settings: settings-subpage-search, add text ellipsis for placeholder text.

chrome/browser/resources/settings/settings_page/settings_subpage_search.html

Index: chrome/browser/resources/settings/settings_page/settings_subpage_search.html
diff --git a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
index 154449346fdc743d82468cb9597dcf52d7935a20..a6203965947d5a92d9c97623850caf3c8c58f687 100644
--- a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
+++ b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
@@ -46,6 +46,10 @@
         -webkit-appearance: none;
       }
 
+      input[placeholder] {
+        text-overflow: ellipsis;
+      }
+
       #searchInput {
         font-size: 92.3076923%;  /* To 12px from 13px. */
         min-height: 24px;