Fix bug: AppShell: CHECK failure in PeerConnection init.

extensions/extensions.gyp

Index: extensions/extensions.gyp
diff --git a/extensions/extensions.gyp b/extensions/extensions.gyp
index 05eaaee889152e848aaac146e55e7f509b6fc223..97d4f998ba57cb7da3b78910cf3c249df3a66d43 100644
--- a/extensions/extensions.gyp
+++ b/extensions/extensions.gyp
@@ -574,8 +574,6 @@
         'browser/extension_icon_image.h',
         'browser/extension_message_filter.cc',
         'browser/extension_message_filter.h',
-        'browser/extension_network_delegate.cc',
-        'browser/extension_network_delegate.h',
         'browser/extension_pref_store.cc',
         'browser/extension_pref_store.h',
         'browser/extension_pref_value_map.cc',
@@ -600,8 +598,6 @@
         'browser/extension_system.h',
         'browser/extension_system_provider.cc',
         'browser/extension_system_provider.h',
-        'browser/extension_url_request_context_getter.cc',
-        'browser/extension_url_request_context_getter.h',
         'browser/extension_util.cc',
         'browser/extension_util.h',
         'browser/extension_web_contents_observer.cc',