Next base/macros.h cleanup step.

src/base/platform/platform-cygwin.cc

Index: src/base/platform/platform-cygwin.cc
diff --git a/src/base/platform/platform-cygwin.cc b/src/base/platform/platform-cygwin.cc
index d93439bf144960b82a89a436845ee1ea7ba14bc2..8a767cf2964214a1b9f96cd29f2cc08960eed16e 100644
--- a/src/base/platform/platform-cygwin.cc
+++ b/src/base/platform/platform-cygwin.cc
@@ -205,7 +205,7 @@ VirtualMemory::VirtualMemory(size_t size)
 
 VirtualMemory::VirtualMemory(size_t size, size_t alignment)
     : address_(NULL), size_(0) {
-  DCHECK(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
+  DCHECK((alignment % OS::AllocateAlignment()) == 0);
   size_t request_size = RoundUp(size + alignment,
                                 static_cast<intptr_t>(OS::AllocateAlignment()));
   void* address = ReserveRegion(request_size);