gn: Update to git HEAD

gn/src/out/last_commit_position.h

@@ -3,7 +3,7 @@
 #ifndef OUT_LAST_COMMIT_POSITION_H_
 #define OUT_LAST_COMMIT_POSITION_H_
 
-#define LAST_COMMIT_POSITION_NUM 2188
-#define LAST_COMMIT_POSITION "2188 (54f5b539df8c)"
+#define LAST_COMMIT_POSITION_NUM 2195
+#define LAST_COMMIT_POSITION "2195 (50ecf4c84d08)"
 
 #endif  // OUT_LAST_COMMIT_POSITION_H_