Set the default focus on the first display in the display settings.

Previously this settings page assumes that there are multiple
displays, but now this page provides settings for a single display.
Better to focus on the first display rather than the secondary one.

BUG=246587
TEST=manually
R=xiyuan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15993017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204064 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/options/chromeos/display_options.js

@@ -839,7 +839,7 @@ cr.define('options', function() {
       if (this.mirroring_)
         this.focusedIndex_ = null;
       else if (this.displays_.length != displays.length)
-        this.focusedIndex_ = 1;
+        this.focusedIndex_ = 0;
 
       this.displays_ = displays;