Bug 1844908 - Remove pre-Win10-specific codepath from xpcom/. r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D184308

xpcom/base/AvailableMemoryTracker.cpp

@@ -7,7 +7,7 @@
 #include "mozilla/AvailableMemoryTracker.h"
 
 #if defined(XP_WIN)
-#  include "mozilla/WindowsVersion.h"
+#  include <windows.h>
 #  include "nsIMemoryReporter.h"
 #endif
 
@@ -116,15 +116,11 @@ nsJemallocFreeDirtyPagesRunnable::Run() {
 
 #if defined(XP_WIN)
 void nsJemallocFreeDirtyPagesRunnable::OptimizeSystemHeap() {
-  // HeapSetInformation exists prior to Windows 8.1, but the
-  // HeapOptimizeResources information class does not.
-  if (IsWin8Point1OrLater()) {
-    HEAP_OPTIMIZE_RESOURCES_INFORMATION heapOptInfo = {
-        HEAP_OPTIMIZE_RESOURCES_CURRENT_VERSION};
+  HEAP_OPTIMIZE_RESOURCES_INFORMATION heapOptInfo = {
+      HEAP_OPTIMIZE_RESOURCES_CURRENT_VERSION};
 
-    ::HeapSetInformation(nullptr, HeapOptimizeResources, &heapOptInfo,
-                         sizeof(heapOptInfo));
-  }
+  ::HeapSetInformation(nullptr, HeapOptimizeResources, &heapOptInfo,
+                       sizeof(heapOptInfo));
 }
 #endif  // defined(XP_WIN)
 

xpcom/glue/standalone/nsXPCOMGlue.cpp

@@ -38,7 +38,6 @@ using LibHandleResult = ::mozilla::Result<LibHandleType, DLErrorType>;
 
 #if defined(XP_WIN)
 #  include <mbstring.h>
-#  include "mozilla/WindowsVersion.h"
 #  include "mozilla/PreXULSkeletonUI.h"
 
 static LibHandleResult GetLibHandle(pathstr_t aDependentLib) {
@@ -301,13 +300,6 @@ static XPCOMGlueLoadResult XPCOMGlueLoad(
     if (l == 0 || *buffer == '#') {
       continue;
     }
-#  ifdef XP_WIN
-    // There is no point in reading Universal CRT forwarder DLLs ahead on
-    // Windows 10 because they will not be touched later.
-    if (IsWin10OrLater() && !strncmp(buffer, "api-", 4)) {
-      continue;
-    }
-#  endif
 
     // cut the trailing newline, if present
     if (buffer[l - 1] == '\n') {