Prefix string16 with base:: in ui/.

ui/base/dragdrop/os_exchange_data_provider_aurax11_unittest.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/base/dragdrop/os_exchange_data_provider_aurax11.h"
 
 // Clean up X11 header polution
 #undef None
 #undef Bool
 
@@ skipping 14 matching lines @@
   provider.SetURL(GURL(kGoogleURL), ASCIIToUTF16(kGoogleTitle));
   {
     GURL out_gurl;
     base::string16 out_str;
     EXPECT_TRUE(provider.GetURLAndTitle(&out_gurl, &out_str));
     EXPECT_EQ(ASCIIToUTF16(kGoogleTitle), out_str);
     EXPECT_EQ(kGoogleURL, out_gurl.spec());
   }
 
   // Check that we can get non-titled entries.
-  provider.SetURL(GURL(kGoogleURL), string16());
+  provider.SetURL(GURL(kGoogleURL), base::string16());
   {
     GURL out_gurl;
     base::string16 out_str;
     EXPECT_TRUE(provider.GetURLAndTitle(&out_gurl, &out_str));
-    EXPECT_EQ(string16(), out_str);
+    EXPECT_EQ(base::string16(), out_str);
     EXPECT_EQ(kGoogleURL, out_gurl.spec());
   }
 }