Prefix string16 with base:: in ui/.

ui/base/l10n/l10n_util_mac_unittest.mm

 // Copyright (c) 2011 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.
 
 #import <Foundation/Foundation.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #include "ui/base/l10n/l10n_util_mac.h"
@@ skipping 19 matching lines @@
     { @"foo bar...", @"foo bar\u2026" },
     { @"foo.bar", @"foo.bar" },
     { @"foo..bar", @"foo..bar" },
     { @"foo...bar", @"foo\u2026bar" },
     { @"foo...bar...", @"foo\u2026bar\u2026" },
     { @"foo(&b)", @"foo" },
     { @"foo(&b)...", @"foo\u2026" },
     { @"(&b)foo", @"foo" },
   };
   for (size_t idx = 0; idx < ARRAYSIZE_UNSAFE(data); ++idx) {
-    string16 input16(base::SysNSStringToUTF16(data[idx].input));
+    base::string16 input16(base::SysNSStringToUTF16(data[idx].input));
 
     NSString* result = l10n_util::FixUpWindowsStyleLabel(input16);
     EXPECT_TRUE(result != nil) << "Fixup Failed, idx = " << idx;
 
     EXPECT_TRUE([data[idx].output isEqual:result])
         << "For idx " << idx << ", expected '" << [data[idx].output UTF8String]
         << "', got '" << [result UTF8String] << "'";
   }
 }