Add d3d11 stable fieldtrial testing configs

R=liberato

Change-Id: I1dea9e0b00675145a57d29318d0fa1e6c3cb6347
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510916Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823309}

testing/variations/fieldtrial_testing_config.json

@@ -2040,17 +2040,11 @@
             ],
             "experiments": [
                 {
-                    "name": "V3EnabledLimited",
+                    "name": "D3D11StableEnabledV2",
                     "enable_features": [
-                        "D3D11PrintCodecOnCrash",
                         "D3D11VideoDecoder",
-                        "D3D11VideoDecoderAllowOverlay",
                         "D3D11VideoDecoderCopyPictures",
                         "D3D11VideoDecoderLimitTo11_0"
-                    ],
-                    "disable_features": [
-                        "D3D11VideoDecoderAlwaysCopy",
-                        "D3D11VideoDecoderSkipMultithreaded"
                     ]
                 }
             ]