Back out bug 1050122 for causing silent timeouts on emulator mochitests. a=me

ipc/glue/ProcessUtils_linux.cpp

@@ -28,7 +28,6 @@
 #include "mozilla/BackgroundHangMonitor.h"
 #include "mozilla/DebugOnly.h"
 #include "base/process_util.h"
-#include "mozilla/Preferences.h"
 
 #include "prenv.h"
 
@@ -191,14 +190,6 @@ ProcLoaderClientGeckoInit()
   MOZ_ASSERT(!sProcLoaderClientGeckoInitialized,
              "call ProcLoaderClientGeckoInit() more than once");
 
-  if (!Preferences::GetBool("dom.ipc.processPrelaunch.enabled", false)) {
-    kill(sProcLoaderPid, SIGKILL);
-    sProcLoaderPid = 0;
-    close(sProcLoaderChannelFd);
-    sProcLoaderChannelFd = -1;
-    return;
-  }
-
   sProcLoaderClientGeckoInitialized = true;
 
   FileDescriptor *fd = new FileDescriptor(sProcLoaderChannelFd);