SandboxIPCProcess: make shutdown mechanism explicit.

content/browser/renderer_host/render_sandbox_host_linux.cc

Index: content/browser/renderer_host/render_sandbox_host_linux.cc
diff --git a/content/browser/renderer_host/render_sandbox_host_linux.cc b/content/browser/renderer_host/render_sandbox_host_linux.cc
index 846ec26f2b76ee8f149b61b057038250649b52d8..0314ce1846836a3f1bf556faead40ad568861d48 100644
--- a/content/browser/renderer_host/render_sandbox_host_linux.cc
+++ b/content/browser/renderer_host/render_sandbox_host_linux.cc
@@ -70,12 +70,16 @@ void RenderSandboxHostLinux::Init() {
   }
 }
 
+bool RenderSandboxHostLinux::ShutdownIPCChannel() {
+  return IGNORE_EINTR(close(childs_lifeline_fd_)) == 0;
+}
+
 RenderSandboxHostLinux::~RenderSandboxHostLinux() {
   if (initialized_) {
+    if (!ShutdownIPCChannel())
+      LOG(ERROR) << "ShutdownIPCChannel failed";
     if (IGNORE_EINTR(close(renderer_socket_)) < 0)
       PLOG(ERROR) << "close";
-    if (IGNORE_EINTR(close(childs_lifeline_fd_)) < 0)
-      PLOG(ERROR) << "close";
   }
 }