Avoid redundant INSERT_PROC_ADDRESS calls
Avoid redundant INSERT_PROC_ADDRESS calls

PVS-Studio pointed out that seven GL functions were being initialized
twice. This isn't critical but is slightly inefficient.

R=7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org
BUG=697659

Change-Id: I199bd06ae1136bc3b8efd519787d89f4447f326d
Reviewed-on: https://chromium-review.googlesource.com/448639
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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