Revert of Add accessibility_unittests and chromevox_tests to buildbot config.

testing/buildbot/chromium.linux.json

Index: testing/buildbot/chromium.linux.json
diff --git a/testing/buildbot/chromium.linux.json b/testing/buildbot/chromium.linux.json
index 5bb6a46314646c96922e0b4364cf2f43607fdbc8..295af5cee299683d96a56c671d408c5481b020d7 100644
--- a/testing/buildbot/chromium.linux.json
+++ b/testing/buildbot/chromium.linux.json
@@ -1,7 +1,6 @@
 {
   "Linux Tests": {
     "gtest_tests": [
-      "accessibility_unittests",
       "app_list_unittests",
       "aura_unittests",
       "interactive_ui_tests",
@@ -56,7 +55,6 @@
   },
   "Linux GTK Tests": {
     "gtest_tests": [
-      "accessibility_unittests",
       "interactive_ui_tests",
       "base_unittests",
       "cacheinvalidation_unittests",
@@ -109,7 +107,6 @@
   },
   "Linux Tests (dbg)(2)(32)": {
     "gtest_tests": [
-      "accessibility_unittests",
       "app_list_unittests",
       "aura_unittests",
       "interactive_ui_tests",
@@ -167,7 +164,6 @@
   },
   "Linux Tests (dbg)(2)": {
     "gtest_tests": [
-      "accessibility_unittests",
       "app_list_unittests",
       "aura_unittests",
       "interactive_ui_tests",
@@ -218,7 +214,6 @@
   },
   "Linux Clang (dbg)": {
     "gtest_tests": [
-      "accessibility_unittests",
       "base_unittests",
       "components_unittests",
       "crypto_unittests",