Prefix string16 with base:: in ui/.

ui/views/linux_ui/status_icon_linux.h

 // Copyright 2013 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.
 
 #ifndef UI_VIEWS_LINUX_UI_STATUS_ICON_LINUX_H_
 #define UI_VIEWS_LINUX_UI_STATUS_ICON_LINUX_H_
 
 #include "base/strings/string16.h"
 #include "ui/views/views_export.h"
 
@@ skipping 20 matching lines @@
 
    protected:
     virtual ~Delegate();
   };
 
   StatusIconLinux();
   virtual ~StatusIconLinux();
 
   virtual void SetImage(const gfx::ImageSkia& image) = 0;
   virtual void SetPressedImage(const gfx::ImageSkia& image) = 0;
-  virtual void SetToolTip(const string16& tool_tip) = 0;
+  virtual void SetToolTip(const base::string16& tool_tip) = 0;
 
   // Invoked after a call to SetContextMenu() to let the platform-specific
   // subclass update the native context menu based on the new model. The
   // subclass should destroy the existing native context menu on this call.
   virtual void UpdatePlatformContextMenu(ui::MenuModel* model) = 0;
 
   // Update all the enabled/checked states and the dynamic labels. Some status
   // icon implementations do not refresh the native menu before showing so we
   // need to manually refresh it when the menu model changes.
   virtual void RefreshPlatformContextMenu();
 
   Delegate* delegate() { return delegate_; }
   void set_delegate(Delegate* delegate) { delegate_ = delegate; }
 
  private:
   Delegate* delegate_;
 };
 
 }  // namespace views
 
 #endif  // UI_LINUX_UI_STATUS_ICON_LINUX_H_