Remove extern "C" barriers to using C++.

Change-Id: Ic046d6aa540738cb46b54531bc59ba3b47b0136d
diff --git a/adb/fdevent.h b/adb/fdevent.h
index a8102ca..8d84b29 100644
--- a/adb/fdevent.h
+++ b/adb/fdevent.h
@@ -19,10 +19,6 @@
 
 #include <stdint.h>  /* for int64_t */
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* events that may be observed */
 #define FDE_READ              0x0001
 #define FDE_WRITE             0x0002
@@ -32,7 +28,7 @@
 /* features that may be set (via the events set/add/del interface) */
 #define FDE_DONT_CLOSE        0x0080
 
-typedef struct fdevent fdevent;
+struct fdevent;
 
 typedef void (*fd_func)(int fd, unsigned events, void *userdata);
 
@@ -82,8 +78,4 @@
     void *arg;
 };
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif