MD Downloads/History: unify page and toolbar background colors

chrome/browser/resources/md_downloads/downloads.html

Index: chrome/browser/resources/md_downloads/downloads.html
diff --git a/chrome/browser/resources/md_downloads/downloads.html b/chrome/browser/resources/md_downloads/downloads.html
index 81e86789528f90513f0e1224b99bc5022cd49942..dce24279c3abcb3f77fa6a919b6d703e8a7279ba 100644
--- a/chrome/browser/resources/md_downloads/downloads.html
+++ b/chrome/browser/resources/md_downloads/downloads.html
@@ -4,9 +4,10 @@
   <meta charset="utf-8">
   <title i18n-content="title"></title>
   <link rel="stylesheet" href="chrome://resources/css/text_defaults_md.css">
-  <style>
+  <link rel="import" href="chrome://resources/html/md_shared_styles.html">
+  <style is="custom-style" include="md-shared-styles">
     html {
-      background: rgb(236, 239, 241);
+      background: var(--md-background-color);
     }
 
     html,