history: make focus outline look good on all platforms.

chrome/browser/resources/history/history.css

Index: chrome/browser/resources/history/history.css
diff --git a/chrome/browser/resources/history/history.css b/chrome/browser/resources/history/history.css
index 2711ba60f2797fd7c9fea7223d6f3f296e58781d..bbcfe79b3dfd5750953975842d9e03d5e48c199a 100644
--- a/chrome/browser/resources/history/history.css
+++ b/chrome/browser/resources/history/history.css
@@ -254,6 +254,7 @@ html[dir='rtl'] #display-filter-controls label span.first-button-component,
   margin-bottom: 6px;
   /* The box should be no bigger than its parent. */
   max-width: 100%;
+  min-height: 2em;
   overflow: hidden;
   padding-bottom: 1px;
 }
@@ -509,6 +510,13 @@ html .expand .site-domain-arrow {
   color: rgb(48, 57, 66);
   margin: 2px;
   padding: 2px;
+<if expr="is_mac">

[Evan Stade, 2014/09/10 18:38:35]

nit: add a comment abuot why the if exprs are necessary

[Dan Beam, 2014/09/10 19:02:08]

Done.

+  margin: 4px;
+  padding: 0;
+</if>
+<if expr="is_win">
+  padding: 0 2px;
+</if>
   text-decoration: none;
 }