Update patches yaml file with description

patches/common/chromium/.patches.yaml

@@ -334,4 +334,6 @@ patches:
 -
   owners: nitsakh
   file: disable_unittests.patch
-  description: Disabling unit tests
+  description: Disabling unit tests
+    GPUTestConfigTest.LoadCurrentConfig test is disabled as it fails
+    on high sierra. It should be updated with newer chromium.

patches/common/chromium/disable_unittests.patch

@@ -1,4 +1,3 @@
-Disable GPU config test as it fails on High Sierra
 diff --git a/gpu/config/gpu_test_config_unittest.cc b/gpu/config/gpu_test_config_unittest.cc
 index e42a805b2d8c..41909e5dc1d6 100644
 --- a/gpu/config/gpu_test_config_unittest.cc