Revert 148351 - Make dbus file descriptor check dynamic

dbus/message.cc

Index: dbus/message.cc
===================================================================
--- dbus/message.cc	(revision 148352)
+++ dbus/message.cc	(working copy)
@@ -18,9 +18,9 @@
 
 // Appends the header name and the value to |output|, if the value is
 // not empty.
-void AppendStringHeader(const std::string& header_name,
-                        const std::string& header_value,
-                        std::string* output) {
+static void AppendStringHeader(const std::string& header_name,
+                               const std::string& header_value,
+                               std::string* output) {
   if (!header_value.empty()) {
     *output += header_name + ": " + header_value + "\n";
   }
@@ -28,24 +28,15 @@
 
 // Appends the header name and the value to |output|, if the value is
 // nonzero.
-void AppendUint32Header(const std::string& header_name,
-                        uint32 header_value,
-                        std::string* output) {
+static void AppendUint32Header(const std::string& header_name,
+                               uint32 header_value,
+                               std::string* output) {
   if (header_value != 0) {
     *output += (header_name + ": " + base::StringPrintf("%u", header_value) +
                 "\n");
   }
 }
 
-// Returns true if Unix FD passing is supported in libdbus.
-// The check is done runtime rather than compile time as the libdbus
-// version used at runtime may be different from the one used at compile time.
-bool IsDBusTypeUnixFdSupported() {
-  int major = 0, minor = 0, micro = 0;
-  dbus_get_version(&major, &minor, &micro);
-  return major >= 1 && minor >= 4;
-}
-
 }  // namespace
 
 namespace dbus {
@@ -220,7 +211,7 @@
         break;
       }
       case UNIX_FD: {
-        CHECK(IsDBusTypeUnixFdSupported());
+        CHECK(kDBusTypeUnixFdIsSupported);
 
         FileDescriptor file_descriptor;
         if (!reader->PopFileDescriptor(&file_descriptor))
@@ -699,7 +690,7 @@
 }
 
 void MessageWriter::AppendFileDescriptor(const FileDescriptor& value) {
-  CHECK(IsDBusTypeUnixFdSupported());
+  CHECK(kDBusTypeUnixFdIsSupported);
 
   if (!value.is_valid()) {
     // NB: sending a directory potentially enables sandbox escape
@@ -969,7 +960,7 @@
 }
 
 bool MessageReader::PopFileDescriptor(FileDescriptor* value) {
-  CHECK(IsDBusTypeUnixFdSupported());
+  CHECK(kDBusTypeUnixFdIsSupported);
 
   int fd = -1;
   const bool success = PopBasic(DBUS_TYPE_UNIX_FD, &fd);