Fix accessability for web notification tray.

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 1663d5bb7e284ab217a2277598ec1272308f7bf0..bd81f272ca4e17ddb6d889fcd190c2f4ef98b6fa 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -35,7 +35,6 @@
 #include "base/utf_string_conversions.h"
 #include "grit/ash_strings.h"
 #include "ui/aura/root_window.h"
-#include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/events.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/compositor/layer.h"
@@ -423,6 +422,10 @@ void SystemTray::AnchorUpdated() {
     bubble_->bubble_view()->UpdateBubble();
 }
 
+string16 SystemTray::GetAccessibleName() {
+  return l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_ACCESSIBLE_NAME);
+}
+
 bool SystemTray::PerformAction(const ui::Event& event) {
   // If we're already showing the default view, hide it; otherwise, show it
   // (and hide any popup that's currently shown).
@@ -445,10 +448,4 @@ bool SystemTray::PerformAction(const ui::Event& event) {
   return true;
 }
 
-void SystemTray::GetAccessibleState(ui::AccessibleViewState* state) {
-  state->role = ui::AccessibilityTypes::ROLE_PUSHBUTTON;
-  state->name = l10n_util::GetStringUTF16(
-      IDS_ASH_STATUS_TRAY_ACCESSIBLE_NAME);
-}
-
 }  // namespace ash