[Service] Refactor unload xwalk extension

unloadInstance() is introduced for optimizing memory on global
model. But with irregular crash problems on UvTaskRunner's
OnTimeout function, it try to access xwalk instance after deleted.

This patch will remove calling unloadInstance() API.
Unloading xwalk extension will be refactored below patch.

Related patch:
  https://review.tizen.org/gerrit/246586/

Change-Id: Ie6a74b815680f02530fd2553427d03bf1634d612
Signed-off-by: DongHyun Song <dh81.song@samsung.com>

diff --git a/wrt_app/common/wrt_xwalk_extension.ts b/wrt_app/common/wrt_xwalk_extension.ts
index f7ba13d..23106e6 100644 (file)
--- a/wrt_app/common/wrt_xwalk_extension.ts
+++ b/wrt_app/common/wrt_xwalk_extension.ts
@@ -220,9 +220,6 @@ export const setRuntimeMessageHandler = (handler: (type: string, data?: string,
 }
 
 export let cleanup = () => {
-  for (var name in extensions_) {
-    extensions_[name].unloadInstance();
-  }
   delete global.tizen;
   instance = undefined;
 }