Moved the AppNotification system into extensions namespace

chrome/browser/extensions/app_notify_channel_ui_impl.cc

Index: chrome/browser/extensions/app_notify_channel_ui_impl.cc
diff --git a/chrome/browser/extensions/app_notify_channel_ui_impl.cc b/chrome/browser/extensions/app_notify_channel_ui_impl.cc
index 02a625d544bbb7bafb4678fd62757c5d8626c3ca..e480300bb10dbfffe8714e371148ce088e5a1e4d 100644
--- a/chrome/browser/extensions/app_notify_channel_ui_impl.cc
+++ b/chrome/browser/extensions/app_notify_channel_ui_impl.cc
@@ -28,6 +28,8 @@
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+namespace extensions {
+
 class AppNotifyChannelUIImpl::InfoBar : public ConfirmInfoBarDelegate {
  public:
   InfoBar(AppNotifyChannelUIImpl* creator,
@@ -205,3 +207,5 @@ void AppNotifyChannelUIImpl::StopObservingSync() {
   ProfileSyncServiceFactory::GetInstance()->GetForProfile(
       profile_)->RemoveObserver(this);
 }
+
+}  // namespace extensions