Moves ash content specific tests into ash_content_unittests

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index dcadd5c129444736a01e4d563ad6fddcf2d7d4a2..2f79ad8b890438b94cd8d41684699fa1753e63ca 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1960,7 +1960,7 @@ test("unit_tests") {
                     ".",
                     "//chrome")
     deps += [
-      "//ash:test_support",
+      "//ash:test_support_with_content",
       "//ash/common/strings",
       "//ash/resources",
     ]
@@ -2106,6 +2106,10 @@ test("unit_tests") {
       "../browser/policy/cloud/user_policy_signin_service_unittest.cc",
       "../browser/signin/signin_manager_unittest.cc",
     ]
+    sources += [
+      "base/ash_test_environment_chrome.cc",
+      "base/ash_test_environment_chrome.h",
+    ]
   }
   if (use_x11) {
     deps += [ "//ui/events/devices" ]