WebUI: Remove last usage of paper-material.

chrome/browser/resources/settings/device_page/display_layout.html

Index: chrome/browser/resources/settings/device_page/display_layout.html
diff --git a/chrome/browser/resources/settings/device_page/display_layout.html b/chrome/browser/resources/settings/device_page/display_layout.html
index ded9ec1ee6f46913a2abced64e96c10d2a7f412f..d5a610f0db709838c995da6b8b0c052f29e01fb2 100644
--- a/chrome/browser/resources/settings/device_page/display_layout.html
+++ b/chrome/browser/resources/settings/device_page/display_layout.html
@@ -1,14 +1,14 @@
 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-resizable-behavior/iron-resizable-behavior.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-material/paper-material-shared-styles.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 <link rel="import" href="drag_behavior.html">
 <link rel="import" href="layout_behavior.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="display-layout">
   <template>
-    <style include="settings-shared paper-material-shared-styles">

[dpapad, 2017/06/03 02:19:46]

I had converted <paper-material> usage to paper-material-shared-styles usage at
https://codereview.chromium.org/2885363006, but now I am realizing that the only
dependency we actually need is paper-styles/shadow.html.

+    <style include="settings-shared">
       /* Use relative position with no offset so that display divs (children),
          which have absolute positions, are offset from the displayArea div. */
       #displayArea {