glx: Disable a test.

The test is failing on intel and amd, but not on nvidia. Disable it
now while I investigate.

TBR=kbr@chromium.org
BUG=780118

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: Iae399d4079aefdd76facfe08df8280ede8b7327c
Reviewed-on: https://chromium-review.googlesource.com/749784Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513273}

ui/gl/gl_context_glx_unittest.cc

@@ -16,7 +16,7 @@
 
 namespace gl {
 
-TEST(GLContextGLXTest, DoNotDesrtroyOnFailedMakeCurrent) {
+TEST(GLContextGLXTest, DISABLED_DoNotDesrtroyOnFailedMakeCurrent) {
   auto* xdisplay = gfx::GetXDisplay();
   ASSERT_TRUE(xdisplay);