MD Settings: Remove usage of deprecated iron-flex-layout.html.

chrome/browser/resources/settings/downloads_page/downloads_page.html

 <link rel="import" href="chrome://resources/html/util.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="../controls/controlled_button.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="downloads_browser_proxy.html">
 
 <dom-module id="settings-downloads-page">
   <template>
     <style include="settings-shared"></style>
     <div class="settings-box first two-line">
       <div class="start">
         <div>$i18n{downloadLocation}</div>
         <div class="secondary" no-search>
 <if expr="not chromeos">
           [[prefs.download.default_directory.value]]
 </if>
 <if expr="chromeos">
           [[getDownloadLocation_(prefs.download.default_directory.value)]]
 </if>
         </div>
       </div>
       <div class="secondary-action">
         <controlled-button class="secondary-button" id="changeDownloadsPath"
             label="$i18n{changeDownloadLocation}"
             on-tap="selectDownloadLocation_"
             pref="[[prefs.download.default_directory]]"
             end-justified>
         </controlled-button>
       </div>
     </div>
-    <div class="settings-box block">
+    <div class="settings-box">

[michaelpg, 2017/04/26 20:36:42]

did you test this change on chromeos? .settings-box is flex-direction: row but I
think these toggle buttons should be stacked vertically. Maybe it works, just
noticed and wanted to make sure chromeos was accounted for :-)

[dpapad, 2017/04/26 21:57:27]

Good catch. Fixed. Restored the "display: block" rule here. I chose to simply
add it directly in this element's style tag, instead of importing the entirety
of iron-positioning [1]. Did the same for the "display: block" I had erroneously
removed in on_startup_page.html.

[1]
https://cs.chromium.org/chromium/src/third_party/polymer/v1_0/components-chro...

       <settings-toggle-button
           pref="{{prefs.download.prompt_for_download}}"
           label="$i18n{promptForDownload}">
       </settings-toggle-button>
 <if expr="chromeos">
       <settings-toggle-button
           pref="{{prefs.gdata.disabled}}"
           label="$i18n{disconnectGoogleDriveAccount}"
           hidden="[[!pageVisibility.googleDrive]]">
       </settings-toggle-button>
 </if>
     </div>
     <template is="dom-if" if="[[autoOpenDownloads_]]" restamp>
       <div class="settings-box">
         <div class="start">
           $i18n{openFileTypesAutomatically}
         </div>
         <div class="secondary-action">
           <paper-button id="resetAutoOpenFileTypes" class="secondary-button"
               on-tap="onClearAutoOpenFileTypesTap_">
             $i18n{clear}
           </paper-button>
         </div>
       </div>
     </template>
   </template>
   <script src="downloads_page.js"></script>
 </dom-module>