Revert of chromeos: Move ownership of system tray width from chrome to ash

chrome/browser/ui/ash/system_tray_delegate_chromeos.cc

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc b/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
index 7c1e46c36882bc5b669b9fd94821abec6a1e2cc7..cff502b8a3b6e44e067817a83058e9b26b06b148 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.cc
@@ -609,6 +609,11 @@
   return have_session_length_limit_;
 }
 
+int SystemTrayDelegateChromeOS::GetSystemTrayMenuWidth() {
+  return l10n_util::GetLocalizedContentsWidthInPixels(
+      IDS_SYSTEM_TRAY_MENU_BUBBLE_WIDTH_PIXELS);
+}
+
 void SystemTrayDelegateChromeOS::ActiveUserWasChanged() {
   SetProfile(ProfileManager::GetActiveUserProfile());
   GetSystemTrayNotifier()->NotifyUserUpdate();