Remove unused struct FDCloser from sandbox_linux.cc

Change-Id: I96707a3d692c0065f5ab9f87e7265df14b5e82de
Reviewed-on: https://chromium-review.googlesource.com/786095Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519775}

services/service_manager/sandbox/linux/sandbox_linux.cc

@@ -58,14 +58,6 @@ namespace service_manager {
 
 namespace {
 
-struct FDCloser {
-  inline void operator()(int* fd) const {
-    DCHECK(fd);
-    PCHECK(0 == IGNORE_EINTR(close(*fd)));
-    *fd = -1;
-  }
-};
-
 void LogSandboxStarted(const std::string& sandbox_name) {
   const std::string process_type =
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(