MD Settings: Cleanup, remove obsolete dependencies.

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

 <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-button/paper-button.html">

[michaelpg, 2016/10/08 08:40:41]

i think we can remove paper-button from the display_layout target in
compiled_resources2.gyp (also the display target): the PaperButtonElement in
display_layout.js should be HTMLDivElement.

Feel free to also add a TODO in display_layout.js asking stevenjb wtf the
"active" property on a div is...

[dpapad, 2016/10/10 17:52:47]

Done.

 <link rel="import" href="/device_page/drag_behavior.html">
 <link rel="import" href="/device_page/layout_behavior.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="display-layout">
   <template>
     <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 {
@@ skipping 47 matching lines @@
             style$="[[getDivStyle_(item.id, item.bounds, visualScale)]]"
             selected$="[[isSelected_(item, selectedDisplay)]]"
             on-tap="onSelectDisplayTap_">
           [[item.name]]
         </div>
       </template>
     </div>
   </template>
   <script src="display_layout.js"></script>
 </dom-module>