Change Select to Speak focus ring color per UI request.

AX-Relnotes: Changes STS focus ring color to a more purple hue.
Bug: 1085231
Change-Id: I7c9305be152aa857c01626839a691adc0a98f126
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225523
Auto-Submit: Katie Dektar <katie@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774622}

chrome/browser/resources/chromeos/accessibility/select_to_speak/prefs_manager.js

@@ -26,7 +26,7 @@ class PrefsManager {
     this.wordHighlight_ = true;
 
     /** @const {string} */
-    this.color_ = '#f73a98';
+    this.color_ = '#da36e8';
 
     /** @private {string} */
     this.highlightColor_ = '#5e9bff';