Fix component build linking with notifications=0

ui/message_center/message_center.gyp

Index: ui/message_center/message_center.gyp
diff --git a/ui/message_center/message_center.gyp b/ui/message_center/message_center.gyp
index 6de3c5bf6eafa3697ab100a1487c834f7520f783..4338ce5e56f0814ef6256959935227f9f8f5b48a 100644
--- a/ui/message_center/message_center.gyp
+++ b/ui/message_center/message_center.gyp
@@ -140,6 +140,7 @@
             ['exclude', '\\.(cc|mm)$'],
             ['include', '^dummy_message_center\\.cc$'],
             ['include', '^message_center_switches\\.cc$'],
+            ['include', '^notification_delegate\\.cc$'],
           ],
         }, {  # notifications==1
           'sources!': [ 'dummy_message_center.cc' ],
@@ -148,7 +149,6 @@
         ['OS=="android"', {
           'sources/': [
             ['include', '^notification\\.cc$'],
-            ['include', '^notification_delegate\\.cc$'],
             ['include', '^notifier_settings\\.cc$'],
           ],
         }],