Remove GMP sandbox code.

dom/media/gmp/GMPParent.cpp

@@ -18,9 +18,6 @@
 #include "nsIObserverService.h"
 #include "GMPTimerParent.h"
 #include "runnable_utils.h"
-#if defined(XP_LINUX) && defined(MOZ_GMP_SANDBOX)
-#include "mozilla/SandboxInfo.h"
-#endif
 #include "GMPContentParent.h"
 #include "MediaPrefs.h"
 #include "VideoUtils.h"
@@ -749,14 +746,6 @@ GMPParent::ReadGMPInfoFile(nsIFile* aFile)
     if (cap.mAPIName.EqualsLiteral(GMP_API_DECRYPTOR)) {
       mCanDecrypt = true;
 
-#if defined(XP_LINUX) && defined(MOZ_GMP_SANDBOX)
-      if (!mozilla::SandboxInfo::Get().CanSandboxMedia()) {
-        printf_stderr("GMPParent::ReadGMPMetaData: Plugin \"%s\" is an EME CDM"
-                      " but this system can't sandbox it; not loading.\n",
-                      mDisplayName.get());
-        return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
-      }
-#endif
 #ifdef XP_WIN
       // Adobe GMP doesn't work without SSE2. Check the tags to see if
       // the decryptor is for the Adobe GMP, and refuse to load it if