crostini: Fix an aria label and reformat crostini_installer/app.html to match style guide.

Test: None
Bug: None
Change-Id: Ied236ecb526d5b35d5d3c70660c622e22f390f11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041839
Commit-Queue: David Munro <davidmunro@google.com>
Reviewed-by: David Munro <davidmunro@google.com>
Reviewed-by: Julian Watson <juwa@google.com>
Auto-Submit: David Munro <davidmunro@google.com>
Cr-Commit-Position: refs/heads/master@{#739287}

chrome/browser/resources/chromeos/crostini_installer/app.html

@@ -79,7 +79,9 @@
 
 <div id="main">
   <svg id="icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 116 121">
-    <path fill-rule="evenodd" d="M33.525 111.127C18.692 103.147 9.128 87.46 8.81 66.719c-1.433.726-3.064.848-4.943.163-5.377-1.96-4.169-8.51-2.197-14.348 1.633-4.835 7.21-8.365 9.942-9.103C17.969 19.072 32.883 0 58 0c25.416 0 40.433 18.285 46.611 43.495 2.8.862 8.129 4.332 9.719 9.04 1.972 5.838 3.18 12.386-2.197 14.347-1.878.685-3.51.563-4.942-.163-.29 20.873-9.852 36.5-24.678 44.438.894.72 1.4 1.651 1.4 2.843 0 3.866 1.882 7-11.913 7-10.067 0-11.785-2.13-11.98-4.447-.668-.422-1.342-1.053-2.02-1.053-.68 0-1.355.682-2.025 1.103C55.76 118.901 53.994 121 44 121c-13.795 0-11.914-3.134-11.914-7 0-1.208.521-2.15 1.439-2.873zM58 107c28.664 0 39-20.35 39-47.4 0-22.444-9.4-43.056-25-46.497C67 12 63.5 24 58 24s-9.5-12-14-10.897C28.334 16.943 19 38.342 19 59.6 19 85.125 29.336 107 58 107zM40 47a6 6 0 110-12 6 6 0 010 12zm36 0a6 6 0 110-12 6 6 0 010 12zm-16.914 3.24l8.234 3.613a2.78 2.78 0 01.934 4.442l-8.188 8.802a2.85 2.85 0 01-4.166-.006l-8.16-8.824a2.77 2.77 0 01.18-3.945c.222-.2.476-.365.75-.487l8.114-3.591a2.856 2.856 0 012.302-.004z"></path>
+    <path fill-rule="evenodd"
+      d="M33.525 111.127C18.692 103.147 9.128 87.46 8.81 66.719c-1.433.726-3.064.848-4.943.163-5.377-1.96-4.169-8.51-2.197-14.348 1.633-4.835 7.21-8.365 9.942-9.103C17.969 19.072 32.883 0 58 0c25.416 0 40.433 18.285 46.611 43.495 2.8.862 8.129 4.332 9.719 9.04 1.972 5.838 3.18 12.386-2.197 14.347-1.878.685-3.51.563-4.942-.163-.29 20.873-9.852 36.5-24.678 44.438.894.72 1.4 1.651 1.4 2.843 0 3.866 1.882 7-11.913 7-10.067 0-11.785-2.13-11.98-4.447-.668-.422-1.342-1.053-2.02-1.053-.68 0-1.355.682-2.025 1.103C55.76 118.901 53.994 121 44 121c-13.795 0-11.914-3.134-11.914-7 0-1.208.521-2.15 1.439-2.873zM58 107c28.664 0 39-20.35 39-47.4 0-22.444-9.4-43.056-25-46.497C67 12 63.5 24 58 24s-9.5-12-14-10.897C28.334 16.943 19 38.342 19 59.6 19 85.125 29.336 107 58 107zM40 47a6 6 0 110-12 6 6 0 010 12zm36 0a6 6 0 110-12 6 6 0 010 12zm-16.914 3.24l8.234 3.613a2.78 2.78 0 01.934 4.442l-8.188 8.802a2.85 2.85 0 01-4.166-.006l-8.16-8.824a2.77 2.77 0 01.18-3.945c.222-.2.476-.365.75-.487l8.114-3.591a2.856 2.856 0 012.302-.004z">
+    </path>
   </svg>
   <div id="status-container" role="status" aria-atomic="false">
     <div id="title">[[getTitle_(state_)]]</div>
@@ -100,12 +102,10 @@
         </cr-input>
       </div>
       <div hidden="[[!showDiskResizing_()]]">
-        <div>$i18n{diskSizeMessage}</div>
+        <div id="disk-size-message">$i18n{diskSizeMessage}</div>
         <div class="outer">
-          <cr-slider id="diskSlider" pin="true"
-                    value="[[defaultDiskSizeTick_]]"
-                    area-describedby="configure-message"
-                    ticks="[[diskSizeTicks_]]">
+          <cr-slider id="diskSlider" pin="true" value="[[defaultDiskSizeTick_]]"
+              aria-describedby="disk-size-message" ticks="[[diskSizeTicks_]]">
           </cr-slider>
           <div id="labels">
             <div id="label-begin">[[minDisk_]]</div>
@@ -114,8 +114,7 @@
         </div>
       </div>
     </div>
-    <div id="installing-message"
-        hidden="[[!eq_(state_, State.INSTALLING)]]">
+    <div id="installing-message" hidden="[[!eq_(state_, State.INSTALLING)]]">
       <div>[[getProgressMessage_(installerState_)]]</div>
       <paper-progress class="progress-bar" value="[[installerProgress_]]">
       </paper-progress>