[ObjC ARC] Converts ios/chrome/browser/ui/history:history to ARC.

ios/chrome/browser/ui/history/BUILD.gn

Index: ios/chrome/browser/ui/history/BUILD.gn
diff --git a/ios/chrome/browser/ui/history/BUILD.gn b/ios/chrome/browser/ui/history/BUILD.gn
index 25c07624c76016879a7e54af4d8aa2f26c74ec84..57f2f8b65bd7e24a67af2337585fb66bbacdf541 100644
--- a/ios/chrome/browser/ui/history/BUILD.gn
+++ b/ios/chrome/browser/ui/history/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 source_set("history") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "clear_browsing_bar.h",
     "clear_browsing_bar.mm",
@@ -93,12 +94,10 @@ source_set("unit_tests") {
   testonly = true
   sources = [
     "favicon_view_provider_unittest.mm",
-    "history_collection_view_controller_unittest.mm",
     "history_entries_status_item_unittest.mm",
     "history_entry_inserter_unittest.mm",
     "history_entry_item_unittest.mm",
     "history_search_view_controller_unittest.mm",
-    "history_service_facade_unittest.mm",
     "history_util_unittest.mm",
     "tab_history_popup_controller_unittest.mm",
   ]
@@ -133,10 +132,59 @@ source_set("unit_tests") {
     "//ui/gfx",
     "//url",
   ]
+
+  public_deps = [
+    ":unit_tests_arc",
+  ]
+  allow_circular_includes_from = [ ":unit_tests_arc" ]
+}
+
+source_set("unit_tests_arc") {
+  testonly = true
+  configs += [ "//build/config/compiler:enable_arc" ]
+
+  sources = [
+    "history_collection_view_controller_unittest.mm",
+    "history_service_facade_unittest.mm",
+  ]
+  deps = [
+    ":history",
+    ":resources_unit_tests",
+    "//base",
+    "//base/test:test_support",
+    "//components/favicon/core",
+    "//components/favicon_base",
+    "//components/history/core/browser",
+    "//components/keyed_service/core",
+    "//components/sessions",
+    "//components/strings",
+    "//ios/chrome/app/strings",
+    "//ios/chrome/browser",
+    "//ios/chrome/browser/browser_state:test_support",
+    "//ios/chrome/browser/history",
+    "//ios/chrome/browser/signin",
+    "//ios/chrome/browser/signin:test_support",
+    "//ios/chrome/browser/ui",
+    "//ios/chrome/browser/ui/collection_view",
+    "//ios/chrome/browser/ui/util",
+    "//ios/chrome/common",
+    "//ios/chrome/test:test_support",
+    "//ios/web",
+    "//ios/web:test_support",
+    "//skia",
+    "//testing/gtest",
+    "//third_party/ocmock",
+    "//ui/base",
+    "//ui/gfx",
+    "//url",
+  ]
 }
 
 bundle_data("resources_unit_tests") {
-  visibility = [ ":unit_tests" ]
+  visibility = [
+    ":unit_tests",
+    ":unit_tests_arc",
+  ]
   testonly = true
   sources = [
     "//ios/chrome/test/data/favicon/test_favicon.png",