Disable failing gpu_perftests on N9

testing/buildbot/chromium.perf.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See //tools/perf/generate_perf_json.py to make changes": {},
   "Android Galaxy S5 Perf (3)": {
     "scripts": [
       {
         "args": [
           "cc_perftests",
           "--adb-path",
           "src/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb"
@@ skipping 72 matching lines @@
   "Android Nexus9 Perf (2)": {
     "scripts": [
       {
         "args": [
           "cc_perftests",
           "--adb-path",
           "src/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb"
         ],
         "name": "cc_perftests",
         "script": "gtest_perf_test.py"
-      },
-      {
-        "args": [
-          "gpu_perftests",
-          "--adb-path",
-          "src/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb"
-        ],
-        "name": "gpu_perftests",
-        "script": "gtest_perf_test.py"
       }
     ]
   },
   "Linux Perf (3)": {
     "scripts": [
       {
         "args": [
           "cc_perftests",
           "--test-launcher-print-test-stdio=always"
         ],
@@ skipping 20943 matching lines @@
           "--gtest_filter=TabCapturePerformanceTest.*:CastV2PerformanceTest.*",
           "--test-launcher-jobs=1",
           "--enable-gpu"
         ],
         "name": "performance_browser_tests",
         "script": "gtest_perf_test.py"
       }
     ]
   }
 }