Reimporting is not happening successfully

My Unity project runs on unity 5.3 and uses the standard asset bundle. The crossPlatformInput scripts are giving many errors. I checked the CrossPlatformInputManager.cs. Here the Namespace is as follows.. namespace UnitySampleAssets.CrossPlatformInput I re imported the standard asset folder. But non of the scripts were updated. So I imported the CrossPlatformInputManager.cs into a new Unity project. There, the statements were different. namespace UnityStandardAssets.CrossPlatformInput These statements does not change even if I reimport the assets. Why this difference? How should I Update these statements without manually doing it? (maybe using an API updater or such..)