Fix buttons after the latest refactor.

Just some styling and import boogs, but they meant buttons
didn't render at all.

NOTRY=true
TBR=leviw@chromium.org

Review URL: https://codereview.chromium.org/564023002

git-svn-id: svn://svn.chromium.org/blink/trunk@181869 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Tools/GardeningServer/ui/ct-failure-stream.html

@@ -6,6 +6,7 @@ found in the LICENSE file.
 
 <link rel="import" href="ct-bot-failure-card.html">
 <link rel="import" href="ct-builder-failure-card.html">
+<link rel="import" href="ct-failure-card-buttons.html">
 <link rel="import" href="ct-trooper-card.html">
 
 <polymer-element name="ct-failure-stream" attributes="groups commitLog tree category title" noscript>
@@ -25,6 +26,10 @@ found in the LICENSE file.
         flex: 1;
       }
 
+      .card > ct-failure-card-buttons {
+        flex: none;
+      }
+
       /* FIXME: Don't use before hax to add labels */
       :host > div:first-of-type::before {
         content: "{{ title }}:";