aura: Make 'ui' buildable without gtk.

ui/base/clipboard/clipboard_unittest.cc

 // 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.
 
 #include "build/build_config.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 124 matching lines @@
                                           Clipboard::BUFFER_STANDARD));
   clipboard.ReadHTML(Clipboard::BUFFER_STANDARD, &markup_result, &url_result);
   EXPECT_TRUE(ClipboardContentsIsExpected(markup, markup_result));
 #if defined(OS_WIN)
   // TODO(playmobil): It's not clear that non windows clipboards need to support
   // this.
   EXPECT_EQ(url, url_result);
 #endif  // defined(OS_WIN)
 }
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#if defined(TOOLKIT_USES_GTK)
 // Regression test for crbug.com/56298 (pasting empty HTML crashes Linux).
 TEST_F(ClipboardTest, EmptyHTMLTest) {
   Clipboard clipboard;
   // ScopedClipboardWriter doesn't let us write empty data to the clipboard.
   clipboard.clipboard_data_ = new Clipboard::TargetMap();
   // The 1 is so the compiler doesn't warn about allocating an empty array.
   char* empty = new char[1];
   clipboard.InsertMapping("text/html", empty, 0U);
   clipboard.SetGtkClipboard();
 
@@ skipping 267 matching lines @@
     writer.WriteBookmark(UTF8ToUTF16("foo"), "bar");
     writer.WriteHyperlink(ASCIIToUTF16("foo"), "bar");
     writer.WriteWebSmartPaste();
     // Left out: WriteFile, WriteFiles, WriteBitmapFromPixels, WritePickledData.
   }
 
   // Passes if we don't crash.
 }
 
 }  // namespace ui