Replace the use of CLD_DATA_FROM* and CLD-related ifdefs with runtime checks.

chrome/browser/component_updater/cld_component_installer.cc

 // 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.
 
 #include "chrome/browser/component_updater/cld_component_installer.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "components/component_updater/component_updater_paths.h"
 #include "components/translate/content/browser/browser_cld_data_provider.h"
+#include "components/translate/content/common/cld_data_source.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/ssl/ssl_config_service.h"
 
 using component_updater::ComponentUpdateService;
 
 namespace {
 // TODO(andrewhayden): Make the data file path into a gyp/gn define
 // If you change this, also update component_cld_data_harness.cc
 // and cld_component_installer_unittest.cc accordingly!
 const base::FilePath::CharType kCldDataFileName[] =
@@ skipping 70 matching lines @@
 void CldComponentInstallerTraits::GetHash(std::vector<uint8>* hash) const {
   hash->assign(kPublicKeySHA256,
                kPublicKeySHA256 + arraysize(kPublicKeySHA256));
 }
 
 std::string CldComponentInstallerTraits::GetName() const {
   return kCldManifestName;
 }
 
 void RegisterCldComponent(ComponentUpdateService* cus) {
+  // Make sure we don't start up if the CLD data source isn't compatible.
+  if (!translate::CldDataSource::ShouldRegisterForComponentUpdates()) {
+    // This is a serious build-time configuration error.
+    LOG(ERROR) << "Wrong CLD data source: " <<
+        translate::CldDataSource::GetName();
+    NOTREACHED();
+    return;
+  }
+
   // This log line is to help with determining which kind of provider has been
   // configured. See also: chrome://translate-internals
   VLOG(1) << "Registering CLD component with the component update service";
 
   scoped_ptr<ComponentInstallerTraits> traits(
       new CldComponentInstallerTraits());
   // |cus| will take ownership of |installer| during installer->Register(cus).
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(traits.Pass());
   installer->Register(cus);
 }
 
 void CldComponentInstallerTraits::SetLatestCldDataFile(
     const base::FilePath& path) {
   VLOG(1) << "Setting CLD data file location: " << path.value();
   g_latest_cld_data_file.Get() = path;
   translate::SetCldDataFilePath(path);
 }
 
 base::FilePath CldComponentInstallerTraits::GetLatestCldDataFile() {
   return g_latest_cld_data_file.Get();
 }
 
 }  // namespace component_updater