Remove support for NPObjects.

content/content_child.gypi

Index: content/content_child.gypi
diff --git a/content/content_child.gypi b/content/content_child.gypi
index ead38e575bf4752daa0bd30f7897cbd34e34fcf3..effc5ca475feab9663804f011df6e8d716217b37 100644
--- a/content/content_child.gypi
+++ b/content/content_child.gypi
@@ -153,15 +153,6 @@
       'child/notifications/pending_notifications_tracker.h',
       'child/npapi/np_channel_base.cc',
       'child/npapi/np_channel_base.h',
-      'child/npapi/npobject_base.h',
-      'child/npapi/npobject_proxy.cc',
-      'child/npapi/npobject_proxy.h',
-      'child/npapi/npobject_stub.cc',
-      'child/npapi/npobject_stub.h',
-      'child/npapi/npobject_util.cc',
-      'child/npapi/npobject_util.h',
-      'child/npapi/npruntime_util.cc',
-      'child/npapi/npruntime_util.h',
       'child/npapi/plugin_host.cc',
       'child/npapi/plugin_host.h',
       'child/npapi/plugin_instance.cc',
@@ -190,8 +181,6 @@
       'child/plugin_message_generator.cc',
       'child/plugin_message_generator.h',
       'child/plugin_messages.h',
-      'child/plugin_param_traits.cc',
-      'child/plugin_param_traits.h',
       'child/power_monitor_broadcast_source.cc',
       'child/power_monitor_broadcast_source.h',
       'child/process_control_impl.cc',