Make startup_tests build and run on Linux (except reference tests).

chrome/test/automation/automation_proxy.h

Index: chrome/test/automation/automation_proxy.h
diff --git a/chrome/test/automation/automation_proxy.h b/chrome/test/automation/automation_proxy.h
index 118983ba3c555772e0f1fa42b07e91a9a0717fbc..ff74db324d2c8a0e5ea30a9577f7e415cacc5177 100644
--- a/chrome/test/automation/automation_proxy.h
+++ b/chrome/test/automation/automation_proxy.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/process_util.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "base/thread.h"
@@ -159,6 +160,10 @@ class AutomationProxy : public IPC::Channel::Listener,
   // passed to the app as a launch parameter.
   const std::wstring& channel_id() const { return channel_id_; }
 
+#if defined(OS_POSIX)
+  base::file_handle_mapping_vector fds_to_map() const;
+#endif
+
   // AutomationMessageSender implementations.
   virtual bool Send(IPC::Message* message);
   virtual bool SendWithTimeout(IPC::Message* message, int timeout,