tree aaa9dc13c590039a15118a0c48e752fac2ff4701
parent b4d40ffae3f955fab2fac838430c89aca452c45f
author dsinclair <dsinclair@chromium.org> 1462471061 -0700
committer Commit bot <commit-bot@chromium.org> 1462471061 -0700

Only set memory tool define if not set.

This fixes a build issue where MEMORY_TOOL_REPLACES_ALLOCATOR may already be
set.

Review-Url: https://codereview.chromium.org/1951383002