Return virtual braille display size as columns and rows, not text count.

chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js b/chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js
index 47fdd0e6188fbcf8dd084a40458f9f63cb398c53..a1d1cc198c9b3218e6ec7f62b07416913d95b5f9 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js
@@ -141,7 +141,9 @@ cvox.BrailleCaptionsBackground.setActive = function(newValue) {
 cvox.BrailleCaptionsBackground.getVirtualDisplayState = function() {
   var self = cvox.BrailleCaptionsBackground;
   if (self.isEnabled()) {
-    return {available: true, textCellCount: 40};  // 40, why not?
+    var rows = parseInt(localStorage['virtualBrailleRows'], 10) || 1;
+    var columns = parseInt(localStorage['virtualBrailleColumns'], 10) || 40;
+    return {available: true, textRowCount: rows, textColumnCount: columns};
   } else {
     return {available: false};
   }