[darwin] NSURL remove workaround for file urls

platform/darwin/src/NSURL+MGLAdditions.m

@@ -7,13 +7,6 @@
         // Relative file URL, already escaped (in order to create the NSURL).
         // Assume a relative path into the application’s resource folder.
         return [NSURL URLWithString:[@"asset://" stringByAppendingString:self.absoluteString]];
-    } else if (self.fileURL) {
-        // Absolute file URL, so construct a new URL using the unescaped path.
-        NSURLComponents *components = [[NSURLComponents alloc] init];
-        components.scheme = @"asset";
-        components.host = @"";
-        components.path = self.path;
-        return components.URL;
     }
     return self;
 }