mac/linux: Fix debug builds from r162518.

The relevant code is used only for aura or Windows.

BUG=none
TBR=thakis@chromium.org

Review URL: https://codereview.chromium.org/11205003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162537 0039d316-1c4b-4281-b951-d872f2087c98

content/content_browser.gypi

@@ -1046,6 +1046,12 @@
         ['exclude', '^browser/geolocation/wifi_data_provider_linux\\.cc$'],
       ],
     }],
+    ['use_aura!=1 and OS!="win"', {
+      'sources!': [
+        'browser/renderer_host/ui_events_helper.cc',
+        'browser/renderer_host/ui_events_helper.h',
+      ],
+    }],
     ['use_aura==1', {
       'dependencies': [
         '../ui/aura/aura.gyp:aura',