Fix the snapshot_cache unittests.

ios/chrome/browser/BUILD.gn

 # Copyright 2015 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("//build/config/features.gni")
 import("//ios/web/js_compile.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
@@ skipping 385 matching lines @@
     "share_extension/share_extension_item_receiver.h",
     "share_extension/share_extension_item_receiver.mm",
     "share_extension/share_extension_service.h",
     "share_extension/share_extension_service.mm",
     "share_extension/share_extension_service_factory.cc",
     "share_extension/share_extension_service_factory.h",
     "snapshots/lru_cache.h",
     "snapshots/lru_cache.mm",
     "snapshots/snapshot_cache.h",
     "snapshots/snapshot_cache.mm",
+    "snapshots/snapshot_cache_internal.h",
     "snapshots/snapshot_manager.h",
     "snapshots/snapshot_manager.mm",
     "snapshots/snapshot_overlay.h",
     "snapshots/snapshot_overlay.mm",
     "snapshots/snapshots_util.h",
     "snapshots/snapshots_util.mm",
     "ssl/ios_chrome_security_state_model_client.h",
     "ssl/ios_chrome_security_state_model_client.mm",
     "ssl/ios_ssl_blocking_page.h",
     "ssl/ios_ssl_blocking_page.mm",
@@ skipping 415 matching lines @@
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser:test_support",
     "//ios/web",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }