variations:unit_test shouldn't depend on field_trial_config:unit_tests

Bug: None
Change-Id: I47fc0e4a15e178072f65358ad8044def01ba1909
Reviewed-on: https://chromium-review.googlesource.com/889618Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532955}

components/BUILD.gn

@@ -153,6 +153,7 @@ test("components_unittests") {
     "//components/url_matcher:unit_tests",
     "//components/url_pattern_index:unit_tests",
     "//components/variations:unit_tests",
+    "//components/variations/field_trial_config:unit_tests",
     "//components/variations/service:unit_tests",
     "//components/web_resource:unit_tests",
     "//components/webdata/common:unit_tests",

components/variations/BUILD.gn

@@ -151,7 +151,6 @@ source_set("unit_tests") {
     "proto",
     "//base/test:test_support",
     "//components/prefs:test_support",
-    "//components/variations/field_trial_config:unit_tests",
     "//testing/gtest",
     "//third_party/zlib/google:compression_utils",
   ]
@@ -165,6 +164,7 @@ test("variations_unittests") {
   deps = [
     ":unit_tests",
     "//components/test:test_support",
+    "//components/variations/field_trial_config:unit_tests",
     "//components/variations/service:unit_tests",
   ]
 }