Skip Win7 dawn_perf_tests

Dawn is only supported on Windows 10

Bug: dawn:208
Change-Id: I13a643953601fe895bba4681bacac370f6724663
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846040Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703864}

testing/buildbot/chromium.perf.json

@@ -298,43 +298,6 @@
           "script": "//testing/trigger_scripts/perf_device_trigger.py"
         }
       },
-      {
-        "args": [
-          "--gtest-benchmark-name",
-          "dawn_perf_tests"
-        ],
-        "isolate_name": "dawn_perf_tests",
-        "merge": {
-          "script": "//tools/perf/process_perf_results.py"
-        },
-        "name": "dawn_perf_tests",
-        "override_compile_targets": [
-          "dawn_perf_tests"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "10de:1cb3",
-              "os": "Windows-2008ServerR2-SP1",
-              "pool": "chrome.tests.perf"
-            }
-          ],
-          "expiration": 7200,
-          "hard_timeout": 43200,
-          "ignore_task_failure": false,
-          "io_timeout": 21600,
-          "shards": 1
-        },
-        "trigger_script": {
-          "args": [
-            "--multiple-dimension-script-verbose",
-            "True"
-          ],
-          "requires_simultaneous_shard_dispatch": true,
-          "script": "//testing/trigger_scripts/perf_device_trigger.py"
-        }
-      },
       {
         "args": [
           "--gtest-benchmark-name",

tools/perf/core/perf_data_generator.py

@@ -681,11 +681,6 @@ BUILDERS = {
             '--use-stub',
         ],
       },
-      {
-        'isolate': 'dawn_perf_tests',
-        'num_shards': 1,
-        'type': TEST_TYPES.GTEST,
-      },
     ],
     'platform': 'win',
     'target_bits': 64,