mash: Move accessibility_types.h from ui namespace to ash namespace

It used to live in the ui namespace but the file moved to //ash.

* Find-and-replace changes across //ash and //chrome/browser
* Fix some include-what-you-use violations

BUG=621574
TEST=compiles, ash_unittests
[email protected] for mechanical changes in //chrome/browser/chromeos
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2078393005
Cr-Commit-Position: refs/heads/master@{#400872}
diff --git a/chrome/browser/chromeos/accessibility/chromevox_panel.cc b/chrome/browser/chromeos/accessibility/chromevox_panel.cc
index d726fd1..b043ce8 100644
--- a/chrome/browser/chromeos/accessibility/chromevox_panel.cc
+++ b/chrome/browser/chromeos/accessibility/chromevox_panel.cc
@@ -139,7 +139,7 @@
 
 void ChromeVoxPanel::DisableSpokenFeedback() {
   chromeos::AccessibilityManager::Get()->EnableSpokenFeedback(
-      false, ui::A11Y_NOTIFICATION_NONE);
+      false, ash::A11Y_NOTIFICATION_NONE);
 }
 
 void ChromeVoxPanel::Focus() {