Prefix string16 with base:: in ui/.

ui/message_center/views/notification_button.cc

 // 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.
 
 #include "ui/message_center/views/notification_button.h"
 
 #include "ui/gfx/canvas.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/constants.h"
 #include "ui/views/background.h"
@@ skipping 36 matching lines @@
                                   message_center::kNotificationButtonIconSize));
     icon_->SetImage(image);
     icon_->SetHorizontalAlignment(views::ImageView::LEADING);
     icon_->SetVerticalAlignment(views::ImageView::LEADING);
     icon_->set_border(views::Border::CreateEmptyBorder(
         message_center::kButtonIconTopPadding, 0, 0, 0));
     AddChildViewAt(icon_, 0);
   }
 }
 
-void NotificationButton::SetTitle(const string16& title) {
+void NotificationButton::SetTitle(const base::string16& title) {
   if (title_ != NULL)
     delete title_;  // This removes the title from this view's children.
   if (title.empty()) {
     title_ = NULL;
   } else {
     title_ = new views::Label(title);
     title_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
     title_->SetEnabledColor(message_center::kRegularTextColor);
     title_->SetBackgroundColor(kRegularTextBackgroundColor);
     title_->set_border(views::Border::CreateEmptyBorder(
@@ skipping 33 matching lines @@
 void NotificationButton::StateChanged() {
   if (state() == STATE_HOVERED || state() == STATE_PRESSED) {
     set_background(views::Background::CreateSolidBackground(
         message_center::kHoveredButtonBackgroundColor));
   } else {
     set_background(NULL);
   }
 }
 
 }  // namespace message_center