mac: Several minor fixes to allocator shim.

base/allocator/allocator_interception_mac.h

Index: base/allocator/allocator_interception_mac.h
diff --git a/base/allocator/allocator_interception_mac.h b/base/allocator/allocator_interception_mac.h
index 54e73de154fa9eaf015c0f3109e5ba8fd04d580a..8867f3823180a9f890c3fb7190ea084a0c128b04 100644
--- a/base/allocator/allocator_interception_mac.h
+++ b/base/allocator/allocator_interception_mac.h
@@ -35,6 +35,11 @@ bool UncheckedCallocMac(size_t num_items, size_t size, void** result);
 // Has no effect on the default malloc zone if the allocator shim already
 // performs that interception.
 BASE_EXPORT void InterceptAllocationsMac();
+
+// Updates all malloc zones to use their original functions.
+// Also calls ClearAllMallocZonesForTesting.
+BASE_EXPORT void UninterceptMallocZonesForTesting();
+
 }  // namespace allocator
 }  // namespace base