gpu: Remove exit_on_context_loss workaround for AMD

This was added as a workaround due to some dEQP-EGL tests failing
without it applied. Testing on latest dev builds shows that these tests pass even with this workaround removed.

BUG=chromium:938678, b:129946471
TEST=dEQP-EGL.functional.robustness.reset_context.shaders.infinite_loop.*
passes on careena

Change-Id: I421af6384fb1c60dde684e13da8bf59330eefd9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2676525
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Drew Davenport <ddavenport@chromium.org>
Cr-Commit-Position: refs/heads/master@{#851017}

gpu/config/gpu_driver_bug_list.json

@@ -2806,18 +2806,6 @@
         "rely_on_implicit_sync_for_swap_buffers"
       ]
     },
-    {
-      "id": 297,
-      "cr_bugs": [938678],
-      "description": "Needed to pass dEQP-EGL.functional.robustness.reset_context.shaders.infinite_loop.*",
-      "os": {
-        "type" : "chromeos"
-      },
-      "vendor_id": "0x1002",
-      "features": [
-        "exit_on_context_lost"
-      ]
-    },
     {
       "id": 299,
       "description": "Context lost recovery often fails on PowerVR Rogue GE8* GPUs on Android.",