Disable CMAA on Tegra

CMAA makes graphics_WebGLPerformance go from 2 failures to 67 failures.
These failures are triggered by GL errors:

GL ERROR :GL_INVALID_FRAMEBUFFER_OPERATION : glFramebufferTexture2D

Let's disable CMAA so we don't break WebGL on Tegra.

BUG=b:67387379, chromium:787087
TEST=graphics_WebGLPerformance failures return to normal on Tegra
NOTRY=true

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;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
Change-Id: Iacaf76ee7a0c9c0f249075f6b65c0e53ace09552
Reviewed-on: https://chromium-review.googlesource.com/780430
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518357}

gpu/config/gpu_driver_bug_list.json

@@ -1729,17 +1729,6 @@
             "op": ">=",
             "value": "3.1"
           }
-        },
-        {
-          "os": {
-            "type" : "chromeos"
-          },
-          "gl_vendor": "NVIDIA.*",
-          "gl_type": "gles",
-          "gl_version": {
-            "op": ">=",
-            "value": "3.1"
-          }
         }
       ],
       "features": [