Revert "Support socket activation of adb server"

This reverts commit 4456b5fc15c233afe3e8aedf5b87aaeed1d9e0f9.

Reason for revert: Device boot failure BUG: 144355953

Change-Id: I539400fa2422bd4d6e396634c629a928cd2ac398
diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index 979413a..466c2ce 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -349,15 +349,8 @@
     return c == '/';
 }
 
-static __inline__ int get_fd_flags(borrowed_fd fd) {
-    return fcntl(fd.get(), F_GETFD);
-}
-
 static __inline__ void close_on_exec(borrowed_fd fd) {
-    int flags = get_fd_flags(fd);
-    if (flags >= 0 && (flags & O_CLOEXEC) == 0) {
-        fcntl(fd.get(), F_SETFD, flags | O_CLOEXEC);
-    }
+    fcntl(fd.get(), F_SETFD, FD_CLOEXEC);
 }
 
 // Open a file and return a file descriptor that may be used with unix_read(),