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

chrome/browser/resources/md_history/app.html

Index: chrome/browser/resources/md_history/app.html
diff --git a/chrome/browser/resources/md_history/app.html b/chrome/browser/resources/md_history/app.html
index 574706423a37bd64582cf6823ad0721bcdb7fde5..f6a3538678cc677c61dce4972f8487d674ebad8c 100644
--- a/chrome/browser/resources/md_history/app.html
+++ b/chrome/browser/resources/md_history/app.html
@@ -58,9 +58,9 @@
       #drawer-header {
         align-items: center;
         border-bottom: 1px solid rgba(0, 0, 0, 0.08);
+        box-sizing: border-box;

[lshang, 2016/10/12 05:15:28]

nit: Is this necessary? This seems to just include the 1px border-bottom line in
the height.

[tsergeant, 2016/10/12 06:06:45]

This is a very minor thing, but the 1px change here ensures that the height of
the side bar is correct -- otherwise, it extends below the bottom of the window
by 1px. 

         display: flex;
         height: var(--toolbar-height);
-        margin-bottom: 5px;
       }
 
       h1 {