MD History: Fix overlapping of sidebar footer in very short windows

chrome/browser/resources/md_history/app.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/cr/ui.html">
 <link rel="import" href="chrome://resources/html/cr/ui/command.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-media-query/iron-media-query.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-pages/iron-pages.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-scroll-target-behavior/iron-scroll-target-behavior.html">
 <link rel="import" href="chrome://history/history_toolbar.html">
 <link rel="import" href="chrome://history/list_container.html">
 <link rel="import" href="chrome://history/router.html">
@@ skipping 40 matching lines @@
         height: 100%;
       }
 
       #drawer:unresolved {
         display: none;
       }
 
       #drawer-header {
         align-items: center;
         border-bottom: 1px solid rgba(0, 0, 0, 0.08);
+        box-sizing: border-box;
         display: flex;
         height: var(--toolbar-height);
-        margin-bottom: 5px;
       }
 
       h1 {
         -webkit-padding-start: 24px;
         color: rgb(66, 66, 66);
         font-size: 123%;
         font-weight: 400;
       }
 
       #drop-shadow {
@@ skipping 63 matching lines @@
         </history-side-bar>
       </app-drawer>
     </template>
 
     <iron-media-query query="(max-width: 1023px)"
         query-matches="{{hasDrawer_}}">
     </iron-media-query>
   </template>
   <script src="chrome://history/app.js"></script>
 </dom-module>