Stop compiling dead download infobar code on desktop Chrome

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 2631 matching lines @@
           'ldflags': [
             # Some android targets still depend on --gc-sections to link.
             # TODO: remove --gc-sections for Debug builds (crbug.com/159847).
             '-Wl,--gc-sections',
           ],
           'dependencies': [
             '../testing/android/native_test.gyp:native_test_native_code',
           ],
         }, {  # Not Android.
           'sources': [ '<@(chrome_unit_tests_non_android_sources)' ],
+          'sources!': [
+            'browser/download/download_request_infobar_delegate_unittest.cc',
+          ],
         }],
         ['enable_themes == 1', {
           'sources': [ '<@(chrome_unit_tests_themes_sources)' ],
         }],
         ['toolkit_views==1', {
           'dependencies': [
             '../components/components.gyp:web_modal_test_support',
             '../ui/views/views.gyp:views',
             '../ui/views/views.gyp:views_test_support',
           ],
@@ skipping 265 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }