Consolidate javascript_dialog_manager.h and javascript_dialog_manager_impl.h

components/app_modal/app_modal_dialog.cc

Index: components/app_modal/app_modal_dialog.cc
diff --git a/components/app_modal/app_modal_dialog.cc b/components/app_modal/app_modal_dialog.cc
index 66daa5af25c220ae883a5fba7a4d05ef39ea09fa..2f7fa9bbe1e47ae2cf06f5a0bccfc2fa335f865b 100644
--- a/components/app_modal/app_modal_dialog.cc
+++ b/components/app_modal/app_modal_dialog.cc
@@ -13,6 +13,7 @@
 
 using content::WebContents;
 
+namespace app_modal {
 namespace {
 
 AppModalDialogObserver* app_modal_dialog_observer = NULL;
@@ -82,3 +83,5 @@ void AppModalDialog::CompleteDialog() {
     AppModalDialogQueue::GetInstance()->ShowNextDialog();
   }
 }
+
+}  // namespace app_modal