MD Downloads/History: unify page and toolbar background colors

chrome/browser/resources/md_history/history_toolbar.html

Index: chrome/browser/resources/md_history/history_toolbar.html
diff --git a/chrome/browser/resources/md_history/history_toolbar.html b/chrome/browser/resources/md_history/history_toolbar.html
index 08ce5176e2704f1cfd6ad4bb261fb121138a0b37..1e99bbf09fa02376f69e42d59f52aae3f22056f8 100644
--- a/chrome/browser/resources/md_history/history_toolbar.html
+++ b/chrome/browser/resources/md_history/history_toolbar.html
@@ -7,9 +7,9 @@
 
 <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;