ChromeVox: If text field changes, only speak if it's focused.

Partially reverts r483795.

The previous behaviour created a bad condition where the Omnibox OnBlur
event needs to deselect the text inside but the deselection erroneously
fires an utterance (even though the text field is deselected).

      interactive_ui_tests --gtest_filter='*SpokenFeedbackTest.*'

Bug: 740430
Test: revert c603f3c7, then run
Change-Id: I9fc8fba2bc0ac29567d26cde5ba49a550a741fa9
Reviewed-on: https://chromium-review.googlesource.com/564869Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487350}

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

@@ -394,15 +394,15 @@ DesktopAutomationHandler.prototype = {
    * @private
    */
   onEditableChanged_: function(evt) {
+    if (!this.createTextEditHandlerIfNeeded_(evt.target))
+      return;
+
     if (!ChromeVoxState.instance.currentRange) {
       this.onEventDefault(evt);
       ChromeVoxState.instance.setCurrentRange(
           cursors.Range.fromNode(evt.target));
     }
 
-    if (!this.createTextEditHandlerIfNeeded_(evt.target))
-      return;
-
     // Sync the ChromeVox range to the editable, if a selection exists.
     var anchorObject = evt.target.root.anchorObject;
     var anchorOffset = evt.target.root.anchorOffset || 0;
@@ -527,7 +527,8 @@ DesktopAutomationHandler.prototype = {
       return false;
 
     var topRoot = AutomationUtil.getTopLevelRoot(node);
-    if (topRoot && topRoot.parent && !topRoot.parent.state.focused)
+    if (!node.state.focused ||
+        (topRoot && topRoot.parent && !topRoot.parent.state.focused))
       return false;
 
     // Re-target the node to the root of the editable.