Simplify registration of a test ChromeBrowserStateManager.

ios/chrome/test/BUILD.gn

Index: ios/chrome/test/BUILD.gn
diff --git a/ios/chrome/test/BUILD.gn b/ios/chrome/test/BUILD.gn
index 80c935636aa5b635b2a24e4fb0f1759a58a8af10..09b7a0e69490fe10fadbd71e6cd9574d0a466968 100644
--- a/ios/chrome/test/BUILD.gn
+++ b/ios/chrome/test/BUILD.gn
@@ -23,6 +23,8 @@ source_set("test_support") {
     "block_cleanup_test.mm",
     "ios_chrome_scoped_testing_chrome_browser_provider.h",
     "ios_chrome_scoped_testing_chrome_browser_provider.mm",
+    "ios_chrome_scoped_testing_chrome_browser_state_manager.cc",
+    "ios_chrome_scoped_testing_chrome_browser_state_manager.h",
     "ios_chrome_scoped_testing_local_state.cc",
     "ios_chrome_scoped_testing_local_state.h",
     "ios_chrome_unit_test_suite.h",
@@ -40,6 +42,7 @@ source_set("test_support") {
     "//components/prefs",
     "//components/prefs:test_support",
     "//ios/chrome/browser",
+    "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/browser_state:browser_state_impl",
     "//ios/chrome/browser/prefs:browser_prefs",
     "//ios/public/provider/chrome/browser",
@@ -122,6 +125,7 @@ test("ios_chrome_unittests") {
     "//ios/chrome/browser/native_app_launcher:unit_tests",
     "//ios/chrome/browser/native_app_launcher:unit_tests_internal",
     "//ios/chrome/browser/net:unit_tests",
+    "//ios/chrome/browser/omaha:unit_tests",
     "//ios/chrome/browser/passwords:unit_tests",
     "//ios/chrome/browser/payments:unit_tests",
     "//ios/chrome/browser/payments/cells:unit_tests",