Bug 1493448: Print out the failing HRESULT when assertion fires in mscom::AgileReference::Clear; r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D26001

--HG--
extra : moz-landing-system : lando

Author: dblohm7

ipc/mscom/AgileReference.cpp

@@ -12,6 +12,11 @@
 #include "mozilla/Move.h"
 #include "mozilla/mscom/Utils.h"
 
+#if defined(MOZILLA_INTERNAL_API)
+#include "nsDebug.h"
+#include "nsPrintfCString.h"
+#endif  // defined(MOZILLA_INTERNAL_API)
+
 #if NTDDI_VERSION < NTDDI_WINBLUE
 
 // Declarations from Windows SDK specific to Windows 8.1
@@ -100,7 +105,13 @@ void AgileReference::Clear() {
   }
 
   DebugOnly<HRESULT> hr = git->RevokeInterfaceFromGlobal(mGitCookie);
+#if defined(MOZILLA_INTERNAL_API)
+  NS_WARNING_ASSERTION(SUCCEEDED(hr), nsPrintfCString(
+      "IGlobalInterfaceTable::RevokeInterfaceFromGlobal failed with HRESULT "
+      "0x%08lX", ((HRESULT)hr)).get());
+#else
   MOZ_ASSERT(SUCCEEDED(hr));
+#endif  // defined(MOZILLA_INTERNAL_API)
   mGitCookie = 0;
 }