Use HttpContext from the controller

src/Umbraco.Core/Configuration/ClientDependencyConfiguration.cs

@@ -57,7 +57,8 @@ namespace Umbraco.Core.Configuration
         /// <summary>
         /// Clears the temporary files stored for the ClientDependency folder
         /// </summary>
-        internal bool ClearTempFiles()
+        /// <param name="currentHttpContext"></param>
+        internal bool ClearTempFiles(HttpContextBase currentHttpContext)
         {
             var cdfTempDirectories = new HashSet<string>();
             foreach (BaseCompositeFileProcessingProvider provider in ClientDependencySettings.Instance
@@ -69,7 +70,7 @@ namespace Umbraco.Core.Configuration
 
             try
             {
-                var relativePath = HttpContext.Current.Server.MapPath(XmlFileMapper.FileMapVirtualFolder);
+                var relativePath = currentHttpContext.Server.MapPath(XmlFileMapper.FileMapVirtualFolder);
                 if (relativePath != null)
                 {
                     var directoryInfo = new DirectoryInfo(relativePath);

src/Umbraco.Web/Install/Controllers/InstallController.cs

@@ -48,7 +48,7 @@ namespace Umbraco.Web.Install.Controllers
                 var clientDependencyConfig = new ClientDependencyConfiguration(ApplicationContext.Current.ProfilingLogger.Logger);
                 var clientDependencyUpdated = clientDependencyConfig.IncreaseVersionNumber();
                 // Delete ClientDependency temp directories to make sure we get fresh caches
-                var clientDependencyTempFilesDeleted = clientDependencyConfig.ClearTempFiles();
+                var clientDependencyTempFilesDeleted = clientDependencyConfig.ClearTempFiles(HttpContext);
 
                 var result = _umbracoContext.Security.ValidateCurrentUser(false);