Bug 1852806 - Remove macros for older Windows SDK from ipc/. r=handyman,mccr8,ipc-reviewers

Depends on D188024

Differential Revision: https://phabricator.services.mozilla.com/D188025

ipc/chromium/src/base/process_util_win.cc

@@ -4,10 +4,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// We need extended process and thread attribute support
-#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600
-
 #include "base/process_util.h"
 
 #include <windows.h>

ipc/mscom/AgileReference.cpp

@@ -18,7 +18,7 @@
 #  include "nsPrintfCString.h"
 #endif  // defined(MOZILLA_INTERNAL_API)
 
-#if NTDDI_VERSION < NTDDI_WINBLUE || defined(__MINGW32__)
+#if defined(__MINGW32__)
 
 // Declarations from Windows SDK specific to Windows 8.1
 
@@ -31,7 +31,7 @@ HRESULT WINAPI RoGetAgileReference(AgileReferenceOptions options, REFIID riid,
                                    IUnknown* pUnk,
                                    IAgileReference** ppAgileReference);
 
-#endif  // NTDDI_VERSION < NTDDI_WINBLUE
+#endif  // defined(__MINGW32__)
 
 namespace mozilla {
 namespace mscom {

ipc/mscom/COMWrappers.h

@@ -9,12 +9,6 @@
 
 #include <objbase.h>
 
-#if (NTDDI_VERSION < NTDDI_WIN8)
-// Win8+ API that we use very carefully
-DECLARE_HANDLE(CO_MTA_USAGE_COOKIE);
-HRESULT WINAPI CoIncrementMTAUsage(CO_MTA_USAGE_COOKIE* pCookie);
-#endif  // (NTDDI_VERSION < NTDDI_WIN8)
-
 // A set of wrapped COM functions, so that we can dynamically link to the
 // functions in combase.dll on win8+. This prevents ole32.dll and many other
 // DLLs loading, which are not required when we have win32k locked down.