Work around bad line break offset calculation

chrome/browser/resources/chromeos/chromevox/cvox2/background/editing.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/editing.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/editing.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/editing.js
index 5f08eee38b33590a08e1ae424614ff611791f3cd..cb44417a5d6fa9772e31ba5bf59d0a1070ee00bb 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/editing.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/editing.js
@@ -133,7 +133,7 @@ AutomationEditableText.prototype = {
   getLineIndex: function(charIndex) {
     if (!this.multiline)
       return 0;
-    var breaks = this.node_.lineStartOffsets || [];
+    var breaks = this.getLineBreaks_();
     var index = 0;
     while (index < breaks.length && breaks[index] <= charIndex)
       ++index;
@@ -168,7 +168,11 @@ AutomationEditableText.prototype = {
   getLineBreaks_: function() {
     // node.lineStartOffsets is undefined when the multiline field has no line
     // breaks.
-    return this.node_.lineStartOffsets || [];
+    // The line break calculation is fuzzy because the last offset doesn't
+    // correspond with the actual text selection data, so let's just ignore it
+    // here...
+    var breaks = this.node_.lineStartOffsets || [];
+    return breaks.slice(0, breaks.length - 1);
   },
 
   /** @private */