Remove old C++03 move emulation code.

dbus/file_descriptor.cc

Index: dbus/file_descriptor.cc
diff --git a/dbus/file_descriptor.cc b/dbus/file_descriptor.cc
index c740f28062244b83ddd8e0727f771a6f8b4ad050..b690881749f8fb10bf3e01ab8d9f12a7b59ab998 100644
--- a/dbus/file_descriptor.cc
+++ b/dbus/file_descriptor.cc
@@ -21,9 +21,8 @@ void CHROME_DBUS_EXPORT FileDescriptor::Deleter::operator()(
       FROM_HERE, base::Bind(&base::DeletePointer<FileDescriptor>, fd), false);
 }
 
-FileDescriptor::FileDescriptor(RValue other)
-    : value_(-1), owner_(false), valid_(false) {
-  Swap(other.object);
+FileDescriptor::FileDescriptor(FileDescriptor&& other) : FileDescriptor() {
+  Swap(&other);
 }
 
 FileDescriptor::~FileDescriptor() {
@@ -31,8 +30,8 @@ FileDescriptor::~FileDescriptor() {
     base::File auto_closer(value_);
 }
 
-FileDescriptor& FileDescriptor::operator=(RValue other) {
-  Swap(other.object);
+FileDescriptor& FileDescriptor::operator=(FileDescriptor&& other) {
+  Swap(&other);
   return *this;
 }