Update code related to OOM errors in sanitizer builds.

base/process/memory.h

Index: base/process/memory.h
diff --git a/base/process/memory.h b/base/process/memory.h
index a930be76d2661a2ce6a3da2920bfb667328c34c6..a73fbe1304834efd77b1b63c84a74007ffed91ee 100644
--- a/base/process/memory.h
+++ b/base/process/memory.h
@@ -67,6 +67,8 @@ BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score);
 // This can be useful for huge and/or unpredictable size memory allocations.
 // Please only use this if you really handle the case when the allocation
 // fails. Doing otherwise would risk security.
+// These functions may still crash on OOM when running under memory tools,
+// specifically ASan and other sanitizers.
 // Return value tells whether the allocation succeeded. If it fails |result| is
 // set to NULL, otherwise it holds the memory address.
 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size,