Add ui_unittests to GN build.

ui/base/dragdrop/os_exchange_data_win_unittest.cc

 // Copyright (c) 2012 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 "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_hglobal.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/clipboard/clipboard.h"
@@ skipping 48 matching lines @@
   EXPECT_EQ(S_OK, com_data->SetData(&format_etc, &medium, TRUE));
 
   // Construct a new object with the old object so that we can use our access
   // APIs.
   OSExchangeData data2(data.provider().Clone());
   EXPECT_TRUE(data2.HasURL(OSExchangeData::CONVERT_FILENAMES));
   GURL url_from_data;
   std::wstring title;
   EXPECT_TRUE(data2.GetURLAndTitle(
       OSExchangeData::CONVERT_FILENAMES, &url_from_data, &title));
-  GURL reference_url(in put);
+  GURL reference_url(input);
   EXPECT_EQ(reference_url.spec(), url_from_data.spec());
 }
 
 // Verifies SetData invoked twice with the same data clobbers existing data.
 TEST(OSExchangeDataWinTest, RemoveData) {
   OSExchangeData data;
   std::wstring input = L"http://www.google.com/";
   std::wstring input2 = L"http://www.google2.com/";
 
   base::win::ScopedComPtr<IDataObject> com_data(
@@ skipping 268 matching lines @@
   OSExchangeData data2(data.provider().Clone());
   ASSERT_TRUE(data2.HasURL(OSExchangeData::CONVERT_FILENAMES));
   GURL read_url;
   std::wstring title;
   EXPECT_TRUE(data2.GetURLAndTitle(
       OSExchangeData::CONVERT_FILENAMES, &read_url, &title));
   EXPECT_EQ(GURL("http://google.com"), read_url);
 }
 
 }  // namespace ui