MD downloads: implement real warning icon

chrome/browser/resources/md_downloads/item.css

Index: chrome/browser/resources/md_downloads/item.css
diff --git a/chrome/browser/resources/md_downloads/item.css b/chrome/browser/resources/md_downloads/item.css
index 1d1cd89d40059e92773666089442df3d18f66bd7..3284e3c7ba4d7c1fa8e6d4cc1781dd88b2d018c6 100644
--- a/chrome/browser/resources/md_downloads/item.css
+++ b/chrome/browser/resources/md_downloads/item.css
@@ -59,11 +59,19 @@
   margin: 0 32px;
 }
 
-#icon {
+#icon,
+.warning {

[groby-ooo-7-16, 2015/08/04 00:56:05]

Am I crazy or should icon be a class and warning be an ID? (Not for this CL, but
in general. It's a rhetorical question )

[Dan Beam, 2015/08/04 01:11:20]

Done.

   height: 32px;
   width: 32px;
 }
 
+.warning {
+  -webkit-mask-image: url(../../../../ui/webui/resources/images/warning.svg);
+  -webkit-mask-repeat: no-repeat;

[groby-ooo-7-16, 2015/08/04 00:56:05]

I can't believe CSS masking is still prefixed... Oh well. Turns out it is, and
the competing standard is languishing. I continue to love web development.

[Dan Beam, 2015/08/04 01:11:20]

Acknowledged.

+  -webkit-mask-size: 100%;
+  background: rgb(217, 84, 61);
+}
+
 #name,
 #file-link,
 #url {