Disable angle_end2end_tests on Win/old AMD.

These tests are flaky, and until we can figure out how to enable
retries only on this config, we should disable them.

BUG=674932
TBR=kbr@chromium.org,ynovikov@chromium.org
NOTRY=true
CQ_INCLUDE_TRYBOTS=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;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2594713002
Cr-Commit-Position: refs/heads/master@{#439819}

content/test/gpu/generate_buildbot_json.py

@@ -983,6 +983,10 @@ COMMON_GTESTS = {
           'Android Release (Nexus 5)',
           'Android Release (Nexus 6)',
           'Android Release (Nexus 9)',
+
+          # These tests are flaky on old AMD.
+          # TODO(jmadill): Enably flaky test retries only on this config.
+          'Win7 Release (AMD R5 230)',
         ],
       },
     ],

testing/buildbot/chromium.gpu.fyi.json

@@ -13573,23 +13573,6 @@
   },
   "Win7 Release (AMD R5 230)": {
     "gtest_tests": [
-      {
-        "args": [
-          "--use-gpu-in-tests",
-          "--test-launcher-retry-limit=0"
-        ],
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "gpu": "1002:6779",
-              "os": "Windows-2008ServerR2-SP1"
-            }
-          ]
-        },
-        "test": "angle_end2end_tests",
-        "use_xvfb": false
-      },
       {
         "args": [
           "--use-gpu-in-tests",