Defer enabling native accessibility until it's used.

We were enabling native accessibility if any accessibility service was
running, but many Android users have accessibility services other than
screen readers. Now we only enable native accessibility if
getAccessibilityNodeProvider is called on the web content.
Many popular Android apps that happen to be accessibility services will
no longer trigger Chrome's accessibility mode.

BUG=280717

Review URL: https://chromiumcodereview.appspot.com/23750002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220541 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed