Moves shared history test helpers into util classes.

components/omnibox/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//third_party/protobuf/proto_library.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 143 matching lines @@
   sources = [
     "in_memory_url_index_cache.proto",
   ]
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "history_index_restore_observer.cc",
     "history_index_restore_observer.h",
+    "in_memory_url_index_test_util.cc",
+    "in_memory_url_index_test_util.h",
     "mock_autocomplete_provider_client.cc",
     "mock_autocomplete_provider_client.h",
     "test_scheme_classifier.cc",
     "test_scheme_classifier.h",
   ]
 
   deps = [
     ":browser",
     "//base",
+    "//components/history/core/browser",
     "//components/metrics/proto",
     "//components/search_engines",
     "//net",
     "//testing/gmock",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
@@ skipping 34 matching lines @@
     "//components/variations",
     "//net:test_support",
     "//sql",
     "//sql:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }