Replace OS_LINUX ifdefs with OS_POSIX & !OS_MACOSX, TOOLKIT_USES_GTK, or

content/browser/zygote_host_linux.cc

Index: content/browser/zygote_host_linux.cc
diff --git a/content/browser/zygote_host_linux.cc b/content/browser/zygote_host_linux.cc
index 4a514362c0307b9a2ff4a1699a9e1ab1ddb9d5b7..0469a979bcca66907e70d163efd4326e3ffbbf58 100644
--- a/content/browser/zygote_host_linux.cc
+++ b/content/browser/zygote_host_linux.cc
@@ -81,7 +81,14 @@ void ZygoteHost::Init(const std::string& sandbox_cmd) {
   cmd_line.AppendSwitchASCII(switches::kProcessType, switches::kZygoteProcess);
 
   int fds[2];
+#if defined(OS_FREEBSD) || defined(OS_OPENBSD)
+  // The BSDs often don't support SOCK_SEQPACKET yet, so fall back to
+  // SOCK_DGRAM if necessary.
+  if (socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fds) != 0)
+    CHECK(socketpair(PF_UNIX, SOCK_DGRAM, 0, fds) == 0);
+#else
   CHECK(socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fds) == 0);
+#endif
   base::file_handle_mapping_vector fds_to_map;
   fds_to_map.push_back(std::make_pair(fds[1], 3));