Add accessibility_unittests and chromevox_tests to buildbot config.

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 59e4c26726f6a3cbacad57a85b6afd8a9935b404..767019d20a32e6cddb041d0e15efe480de5c9be7 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -27,6 +27,7 @@
   },
   "XP Tests (2)": {
     "gtest_tests": [
+      "accessibility_unittests",
       "base_unittests",
       "net_unittests",
       "views_unittests",
@@ -83,6 +84,7 @@
   },
   "Vista Tests (2)": {
     "gtest_tests": [
+      "accessibility_unittests",
       "base_unittests",
       "net_unittests",
       "views_unittests",
@@ -149,6 +151,7 @@
   },
   "Win7 Tests (2)": {
     "gtest_tests": [
+      "accessibility_unittests",
       "base_unittests",
       "net_unittests",
       "views_unittests",
@@ -215,6 +218,7 @@
   },
   "Win 7 Tests x64 (2)": {
     "gtest_tests": [
+      "accessibility_unittests",
       "base_unittests",
       "chrome_elf_unittests",
       "net_unittests",
@@ -249,6 +253,7 @@
   },
   "Win7 Tests (dbg)(1)": {
     "gtest_tests": [
+      "accessibility_unittests",
       "base_unittests",
       "cacheinvalidation_unittests",
       "cast_unittests",