dbus: Make it possible to build as shared_library.

dbus/file_descriptor.h

Index: dbus/file_descriptor.h
diff --git a/dbus/file_descriptor.h b/dbus/file_descriptor.h
index 5b89f2f44534e1d6250322d6ff6e0d64182ae508..19e0b1ab44b32da4b419a5bef30fbcc4cb386a75 100644
--- a/dbus/file_descriptor.h
+++ b/dbus/file_descriptor.h
@@ -5,6 +5,9 @@
 #ifndef DBUS_FILE_DESCRIPTOR_H_
 #define DBUS_FILE_DESCRIPTOR_H_
 
+#include "base/basictypes.h"
+#include "dbus/dbus_export.h"
+
 namespace dbus {
 
 // FileDescriptor is a type used to encapsulate D-Bus file descriptors
@@ -28,7 +31,7 @@ namespace dbus {
 // directory to reduce the security risks.  Splitting out validation
 // also allows the caller to do this work on the File thread to conform
 // with i/o restrictions.
-class FileDescriptor {
+class CHROME_DBUS_EXPORT FileDescriptor {
  public:
   // Permits initialization without a value for passing to
   // dbus::MessageReader::PopFileDescriptor to fill in and from int values.