Move UnixDomainSocket to base namespace

content/browser/renderer_host/sandbox_ipc_linux.cc

Index: content/browser/renderer_host/sandbox_ipc_linux.cc
diff --git a/content/browser/renderer_host/sandbox_ipc_linux.cc b/content/browser/renderer_host/sandbox_ipc_linux.cc
index bc24bca724955927cb79c4cc8dcba665281e9108..0c073bfb3eb0b19760eb202b85615cea94487958 100644
--- a/content/browser/renderer_host/sandbox_ipc_linux.cc
+++ b/content/browser/renderer_host/sandbox_ipc_linux.cc
@@ -131,7 +131,8 @@ void SandboxIPCHandler::HandleRequestFromRenderer(int fd) {
   // error for a maximum length message.
   char buf[FontConfigIPC::kMaxFontFamilyLength + 128];
 
-  const ssize_t len = UnixDomainSocket::RecvMsg(fd, buf, sizeof(buf), &fds);
+  const ssize_t len =
+      base::UnixDomainSocket::RecvMsg(fd, buf, sizeof(buf), &fds);
   if (len == -1) {
     // TODO: should send an error reply, or the sender might block forever.
     NOTREACHED() << "Sandbox host message is larger than kMaxFontFamilyLength";