Prefix string16 with base:: in ui/.

ui/views/controls/styled_label_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 <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 333 matching lines @@
 
   ASSERT_EQ(5, styled()->child_count());
   EXPECT_EQ(0, styled()->child_at(0)->bounds().x());
   EXPECT_EQ(styled()->child_at(0)->bounds().right() - 2,
             styled()->child_at(1)->bounds().x());
   EXPECT_EQ(0, styled()->child_at(2)->bounds().x());
   EXPECT_EQ(styled()->child_at(2)->bounds().right() - 2,
             styled()->child_at(3)->bounds().x());
   EXPECT_EQ(0, styled()->child_at(4)->bounds().x());
 
-  string16 tooltip;
+  base::string16 tooltip;
   EXPECT_TRUE(
       styled()->child_at(1)->GetTooltipText(gfx::Point(1, 1), &tooltip));
   EXPECT_EQ(ASCIIToUTF16("tooltip"), tooltip);
   EXPECT_TRUE(
       styled()->child_at(2)->GetTooltipText(gfx::Point(1, 1), &tooltip));
   EXPECT_EQ(ASCIIToUTF16("tooltip"), tooltip);
 }
 
 TEST_F(StyledLabelTest, HandleEmptyLayout) {
   const std::string text("This is a test block of text, ");
   InitStyledLabel(text);
   styled()->Layout();
   ASSERT_EQ(0, styled()->child_count());
 }
 
 }  // namespace