Prefix string16 with base:: in ui/.

ui/views/widget/tooltip_manager_aura.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/views/widget/tooltip_manager_aura.h"
 
 #include "base/logging.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/client/tooltip_client.h"
 #include "ui/aura/root_window.h"
@@ skipping 106 matching lines @@
     return root_view->GetTooltipHandlerForPoint(point);
   return NULL;
 }
 
 void TooltipManagerAura::UpdateTooltipForTarget(View* target,
                                                 const gfx::Point& point,
                                                 aura::Window* root_window) {
   if (target) {
     gfx::Point view_point = point;
     View::ConvertPointFromWidget(target, &view_point);
-    string16 new_tooltip_text;
+    base::string16 new_tooltip_text;
     if (!target->GetTooltipText(view_point, &new_tooltip_text))
       tooltip_text_.clear();
     else
       tooltip_text_ = new_tooltip_text;
   } else {
     tooltip_text_.clear();
   }
   aura::client::GetTooltipClient(root_window)->UpdateTooltip(GetWindow());
 }
 
 aura::Window* TooltipManagerAura::GetWindow() {
   return widget_->GetNativeView();
 }
 
 }  // namespace views.