Fix GL_KHR_debug extension functions names
Fix GL_KHR_debug extension functions names

Otherwise, running end2end tests on Nexus 5X crashes.

BUG=angleproject:1362
TEST=angle_end2end_tests on Nexus 5X

Change-Id: I063d9f9836a1575cbf0abe361dbf8b2c1492105d
Reviewed-on: https://chromium-review.googlesource.com/349420
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Commit-Queue: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>

ppy/angle,ppy/angle,MSOpenTech/angle,ppy/angle,domokit/waterfall,MSOpenTech/angle,ecoal95/angle,MSOpenTech/angle,MSOpenTech/angle,ecoal95/angle,ecoal95/angle,ecoal95/angle,ppy/angle,domokit/waterfall,ecoal95/angle