Disabled gpu_perftests on nexus 6 (crashing) and cc_perftests on Android One (failing)

BUG=469160,469166

Review URL: https://codereview.chromium.org/1024753004

Cr-Commit-Position: refs/heads/master@{#321580}

testing/buildbot/chromium.perf.json

@@ -46,11 +46,6 @@
   },
   "Android Nexus6 Perf": {
     "scripts": [
-      {
-        "name": "gpu_perftests",
-        "script": "gtest_perf_test.py",
-        "args": ["gpu_perftests"]
-      },
       {
         "name": "cc_perftests",
         "script": "gtest_perf_test.py",
@@ -110,11 +105,6 @@
   },
   "Android One Perf": {
     "scripts": [
-      {
-        "name": "cc_perftests",
-        "script": "gtest_perf_test.py",
-        "args": ["cc_perftests"]
-      }
     ]
   },
   "Android MotoE Perf": {