Consolidate javascript_dialog_manager.h and javascript_dialog_manager_impl.h

components/app_modal/app_modal_dialog_queue.cc

Index: components/app_modal/app_modal_dialog_queue.cc
diff --git a/components/app_modal/app_modal_dialog_queue.cc b/components/app_modal/app_modal_dialog_queue.cc
index b90ceb3d821821b403f2cdc90bb897972da8b490..2bb527d709af1e5ee4f377fd9c7dfae4f7bbde67 100644
--- a/components/app_modal/app_modal_dialog_queue.cc
+++ b/components/app_modal/app_modal_dialog_queue.cc
@@ -7,6 +7,8 @@
 #include "base/memory/singleton.h"
 #include "components/app_modal/app_modal_dialog.h"
 
+namespace app_modal {
+
 // static
 AppModalDialogQueue* AppModalDialogQueue::GetInstance() {
   return Singleton<AppModalDialogQueue>::get();
@@ -74,3 +76,5 @@ AppModalDialog* AppModalDialogQueue::GetNextDialog() {
   }
   return NULL;
 }
+
+}  // namespace app_modal