[dashboard] Use "dialog-dismiss" and "dialog-confirm" w/ paper-dialogs

dashboard/dashboard/elements/chart-tooltip.html

Index: dashboard/dashboard/elements/chart-tooltip.html
diff --git a/dashboard/dashboard/elements/chart-tooltip.html b/dashboard/dashboard/elements/chart-tooltip.html
index bbb31e902b58ff5855a23bb47ca5dd4282610160..cbea4d2d8983edc76eb1fb7179f5044cfcc10745 100644
--- a/dashboard/dashboard/elements/chart-tooltip.html
+++ b/dashboard/dashboard/elements/chart-tooltip.html
@@ -111,10 +111,10 @@ was just clicked.
         </div>
 
         <div class="card-actions">
-          <bisect-button affirmative xsrf-token="{{xsrfToken}}"
+          <bisect-button dialog-confirm xsrf-token="{{xsrfToken}}"
                          bug-id="{{bugId}}"
                          bisect-info="{{bisectInfo}}"></bisect-button>
-          <trace-button affirmative xsrf-token="{{xsrfToken}}"
+          <trace-button dialog-confirm xsrf-token="{{xsrfToken}}"
                         bug-id="{{bugId}}"
                         trace-info="{{bisectInfo}}"></trace-button>
         </div>