Consolidate javascript_dialog_manager.h and javascript_dialog_manager_impl.h

components/app_modal_dialogs/javascript_native_dialog_factory.h

Index: components/app_modal_dialogs/javascript_native_dialog_factory.h
diff --git a/components/app_modal_dialogs/javascript_native_dialog_factory.h b/components/app_modal_dialogs/javascript_native_dialog_factory.h
index 513c11993332e8968bd768031eb7345a1da02518..37bbe0e3805636109f18f1885d393a0eefc60fed 100644
--- a/components/app_modal_dialogs/javascript_native_dialog_factory.h
+++ b/components/app_modal_dialogs/javascript_native_dialog_factory.h
@@ -8,6 +8,8 @@
 
 #include "ui/gfx/native_widget_types.h"
 
+namespace app_modal_dialogs {
+
 class JavaScriptAppModalDialog;
 class NativeAppModalDialog;
 
@@ -21,4 +23,6 @@ class JavaScriptNativeDialogFactory {
       gfx::NativeWindow parent_window) = 0;
 };
 
+}  // namespace app_modal_dialogs
+
 #endif  // COMPONENTS_APP_MODAL_DIALOGS_JAVASCRIPT_NATIVE_DIALOG_FACTORY_H_