md-history: Fix a search field regression caused by r410495.

chrome/browser/resources/md_history/app.vulcanized.html

Index: chrome/browser/resources/md_history/app.vulcanized.html
diff --git a/chrome/browser/resources/md_history/app.vulcanized.html b/chrome/browser/resources/md_history/app.vulcanized.html
index dbf6ce623ab8923433c8727b854ba8a597ce4142..da1c2623d3c8e885fadaabad0e9cc6894486a2a9 100644
--- a/chrome/browser/resources/md_history/app.vulcanized.html
+++ b/chrome/browser/resources/md_history/app.vulcanized.html
@@ -2314,13 +2314,13 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
           font-size: inherit;
         };
         -webkit-padding-start: 2px;
+        -webkit-padding-end: 1px;
         flex: 1;
       }
 
-      input[type='search']::-webkit-search-decoration,
-      input[type='search']::-webkit-search-cancel-button,
-      input[type='search']::-webkit-search-results-button {
+      input[type='search']::-webkit-search-cancel-button {
         -webkit-appearance: none;
+        margin: 0;
       }
 
       /** Wide layout. */