mac: Hook up allocator shim.

base/process/memory.h

Index: base/process/memory.h
diff --git a/base/process/memory.h b/base/process/memory.h
index 77911cfc3501cbd6f97313f1f9db008848838423..435bbb7c153f34a2b22210c899f074db47d841b4 100644
--- a/base/process/memory.h
+++ b/base/process/memory.h
@@ -11,6 +11,11 @@
 #include "base/process/process_handle.h"
 #include "build/build_config.h"
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+#include <mach/mach_vm.h>
+#include "third_party/apple_apsl/malloc.h"
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
 #ifdef PVALLOC_AVAILABLE
 // Build config explicitly tells us whether or not pvalloc is available.
 #elif defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
@@ -48,6 +53,13 @@ const int kMaxOomScore = 1000;
 BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score);
 #endif
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+void DeprotectMallocZone(ChromeMallocZone* default_zone,
+                         mach_vm_address_t* reprotection_start,
+                         mach_vm_size_t* reprotection_length,
+                         vm_prot_t* reprotection_value);
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
 #if defined(OS_WIN)
 namespace win {