V8 Buildbot: Fix mail notifier super call.
V8 Buildbot: Fix mail notifier super call.

Fix after https://codereview.chromium.org/1130943005/

Old style classes.

TBR=tandrii@chromium.org, kjellander@chromium.org, hablich@chromium.org

Review URL: https://codereview.chromium.org/1148723003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@295325 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build