Revert of Use setSequentialFocusNavigationStartingPoint in ChromeVox

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
index db92e2e2b5a292d4403e12454d59703ca8014a2b..8b57e089303b6107dd79721e451e75429f5c7e74 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
@@ -766,37 +766,25 @@
     if (start.state.focused || end.state.focused)
       return;
 
-    var isFocusableLinkOrControl = function(node) {
-      return node.state.focusable &&
-          AutomationPredicate.linkOrControl(node);
+    // Iframes, when focused, causes the child webArea to fire focus
+    // event.  This can result in getting stuck when navigating
+    // backward.
+    var isFocusable = function(node) {
+      return node.role != RoleType.iframe &&
+          node.state.focusable &&
+          !node.state.focused &&
+          !AutomationPredicate.structuralContainer(node);
     };
-
-    // First, try to focus the start or end node.
-    if (isFocusableLinkOrControl(start)) {
-      if (!start.state.focused)
-        start.focus();
+    if (isFocusable(start)) {
+      start.focus();
       return;
-    } else if (isFocusableLinkOrControl(end)) {
-      if (!end.state.focused)
-        end.focus();
+    }
+    if (isFocusable(end)) {
+      end.focus();
       return;
     }
 
-    // If a common ancestor of |start| and |end| is a link, focus that.
-    var ancestor = AutomationUtil.getLeastCommonAncestor(start, end);
-    while (ancestor && ancestor.root == start.root) {
-      if (isFocusableLinkOrControl(ancestor)) {
-        if (!ancestor.state.focused)
-          ancestor.focus();
-        return;
-      }
-      ancestor = ancestor.parent;
-    }
-
-    // If nothing is focusable, set the sequential focus navigation starting
-    // point, which ensures that the next time you press Tab, you'll reach
-    // the next or previous focusable node from |start|.
-    start.setSequentialFocusNavigationStartingPoint();
+    // TODO(dmazzoni): Set sequential focus.
   }
 };