Fix unbalanced start/end ignore in Valgrind interceptor for free().
Fix unbalanced start/end ignore in Valgrind interceptor for free().

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/6927006

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5152 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client