MD Downloads: fix unvulcanized build by adding <style no-process>

chrome/browser/resources/md_downloads/manager.html

Index: chrome/browser/resources/md_downloads/manager.html
diff --git a/chrome/browser/resources/md_downloads/manager.html b/chrome/browser/resources/md_downloads/manager.html
index 3e18aa355c12b1f893b32adc418981f7e262491b..e32fe5710dfbf016115a5b45d2a20628374110d0 100644
--- a/chrome/browser/resources/md_downloads/manager.html
+++ b/chrome/browser/resources/md_downloads/manager.html
@@ -11,9 +11,9 @@
 <link rel="import" href="chrome://downloads/toolbar.html">
 
 <dom-module id="downloads-manager">
+  <link rel="stylesheet" href="chrome://resources/css/md_colors.css">

[michaelpg, 2016/05/05 16:51:44]

what is the functional difference in moving this link?

in unvulcanized builds, previously it wouldn't fetch the resource until the
template was stamped, and now it fetches the resource at load time?

either way the variables get natively imported, right?

[Dan Beam, 2016/05/05 17:12:01]

http://i.imgur.com/Gw9zEVg.png -> <link> doesn't work in shadow DOM, I've moved
it to a different place in a separate CL here:
https://codereview.chromium.org/1948023004

it so happens that this <link> is also needed by the main page, so it's
previously loaded as well.  but for IWYU purposes, I'm still gonna put it at the
top of this page.

   <template>
-    <link rel="stylesheet" href="chrome://resources/css/md_colors.css">
-    <style>
+    <style no-process>
       #toolbar {
         background: var(--md-toolbar-color);
       }