allocator/Windows: delete the old non-unified allocator-shim

chrome/installer/setup/memory_unittest.cc

Index: chrome/installer/setup/memory_unittest.cc
diff --git a/chrome/installer/setup/memory_unittest.cc b/chrome/installer/setup/memory_unittest.cc
index a7968e37dcbe5cc993a34bdc117c3c34ba4efd40..9230162e0373775a292d73d6cce147c6b75ee5db 100644
--- a/chrome/installer/setup/memory_unittest.cc
+++ b/chrome/installer/setup/memory_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <limits>
 
+#include "base/allocator/features.h"
 #include "base/process/memory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -13,7 +14,7 @@
 #include "base/allocator/allocator_interception_mac.h"
 #endif
 
-#if defined(ALLOCATOR_SHIM)
+#if BUILDFLAG(USE_ALLOCATOR_SHIM)
 // Test that the allocator shim is in-place so that base::UncheckedMalloc works.
 TEST(OutOfMemoryHandledTest, UncheckedMalloc) {
   // Enable termination on OOM - just as setup.exe does at early initialization
@@ -40,4 +41,4 @@ TEST(OutOfMemoryHandledTest, UncheckedMalloc) {
   base::allocator::UninterceptMallocZonesForTesting();
 #endif
 }
-#endif  // ALLOCATOR_SHIM
+#endif  // BUILDFLAG(USE_ALLOCATOR_SHIM)