Prefix string16 with base:: in ui/.

ui/app_list/views/app_list_item_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/app_list/views/app_list_item_view.h"
 
 #include <algorithm>
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/app_list/app_list_constants.h"
@@ skipping 116 matching lines @@
                                                             icon_shadows_));
     icon_->SetImage(shadow);
     return;
   };
 
   icon_->SetImage(resized);
 }
 
 void AppListItemView::UpdateTooltip() {
   title_->SetTooltipText(model_->title() == model_->full_name() ?
-                             string16() : UTF8ToUTF16(model_->full_name()));
+      base::string16() : UTF8ToUTF16(model_->full_name()));
 }
 
 void AppListItemView::SetUIState(UIState state) {
   if (ui_state_ == state)
     return;
 
   ui_state_ = state;
 
 #if defined(USE_AURA)
   switch (ui_state_) {
@@ skipping 309 matching lines @@
   }
   if (!event->handled())
     CustomButton::OnGestureEvent(event);
 }
 
 void AppListItemView::OnSyncDragEnd() {
   SetUIState(UI_STATE_NORMAL);
 }
 
 }  // namespace app_list