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The changes in 8f2032ae remove the code
that used the variables that were used introduced in
f52b1e62.

This change removes those variables and the associated code in the
destructor.

BUG=640275
TEST=still builds.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2264403003
Cr-Commit-Position: refs/heads/master@{#414839}