Remove custom expectaton for inspector/profiler/heap-snapshot-loader.html

BUG=330617
TBR=loislo@chromium.org

Review URL: https://codereview.chromium.org/132233043

git-svn-id: svn://svn.chromium.org/blink/trunk@165517 bbb929c8-8fbe-4397-9dbb-9b2b20218538