Consolidate javascript_dialog_manager.h and javascript_dialog_manager_impl.h

components/app_modal/javascript_dialog_extensions_client.h

Index: components/app_modal/javascript_dialog_extensions_client.h
diff --git a/components/app_modal/javascript_dialog_extensions_client.h b/components/app_modal/javascript_dialog_extensions_client.h
index 466aaebee8cc198b09622d64c6fac26a0249b2b9..f85976e99b16df944ddebbb3b837c02276611f02 100644
--- a/components/app_modal/javascript_dialog_extensions_client.h
+++ b/components/app_modal/javascript_dialog_extensions_client.h
@@ -13,6 +13,8 @@ namespace content {
 class WebContents;
 }
 
+namespace app_modal {
+
 // A client interface to access and control extensions/apps
 // that opened a JavaScript dialog.
 class JavaScriptDialogExtensionsClient {
@@ -35,4 +37,6 @@ class JavaScriptDialogExtensionsClient {
                                 std::string* name_out) = 0;
 };
 
+}  // namespace app_modal
+
 #endif  // COMPONENTS_APP_MODAL_JAVASCRIPT_DIALOG_EXTENSIONS_CLIENT_H_