MD Downloads/History: unify page and toolbar background colors

chrome/browser/resources/md_history/history_toolbar.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_search_field/cr_search_field.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-toolbar">
   <template>
-    <style include="shared-style">
+    <style include="md-shared-styles shared-style">
       :host {
-        background: rgb(63, 85, 102);
+        background: var(--md-toolbar-color);
         color: #fff;
         height: 56px;
         transition: background-color 150ms;
       }
 
       :host,
       #overlay-buttons,
       #overlay-wrapper,
       #main-content,
       #button-container,
       #toolbar-container {
         @apply(--layout-center);
         @apply(--layout-horizontal);
         width: 100%;
       }
 
       :host([items-selected_]) {
         background: rgb(68, 136, 255);

[dschuyler, 2016/04/20 20:44:46]

Should using a var for this background color
be part of the this CL?

[Dan Beam, 2016/04/21 01:42:35]

I don't think it's shared anywhere else yet

       }
 
       h1 {
         @apply(--layout-flex);
         -webkit-padding-start: 24px;
         font-size: 123%;
         font-weight: 400;
       }
 
       #left-content,
@@ skipping 68 matching lines @@
           </paper-button>
           <paper-button id="delete-button" on-tap="onDeleteTap_">
             $i18n{delete}
           </paper-button>
         </div>
       </div>
     </div>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>