aura: Make 'ui' buildable without gtk.

ui/ui_unittests.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'ui_test_support',
       'dependencies': [
         '../base/base.gyp:base',
@@ skipping 120 matching lines @@
               '-loleacc.lib',
             ],
           },
         }],
         ['OS != "mac"', {
           'sources': [
             'gfx/transform_unittest.cc',
             'gfx/interpolated_transform_unittest.cc',
           ],
         }],
-        ['toolkit_uses_gtk == 1', {
-          'sources': [
-            'base/dragdrop/gtk_dnd_util_unittest.cc',
-          ],
+        ['use_glib == 1', {
           'dependencies': [
-            '../build/linux/system.gyp:gtk',
+            '../build/linux/system.gyp:pangocairo',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
             'base/strings/ui_strings.gyp:ui_unittest_strings',
           ],
           'conditions': [
             ['linux_use_tcmalloc==1', {
                'dependencies': [
                  '../base/allocator/allocator.gyp:allocator',
                ],
             }],
             ['toolkit_views==1', {
               'sources!': [
                 'browser/ui/gtk/gtk_expanded_container_unittest.cc',
               ],
             }],
           ],
         }],
+        ['toolkit_uses_gtk == 1', {
+          'sources': [
+            'base/dragdrop/gtk_dnd_util_unittest.cc',
+          ],
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+          ],
+        }],
         ['toolkit_views==1', {
           'sources': [
             'gfx/render_text_unittest.cc',
           ],
         }],
       ],
     },
   ],
 }