clang/win: Fix most -Wunused-function warnings in Chromium code.

chrome/installer/util/google_update_settings.cc

 // Copyright (c) 2012 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/installer/util/google_update_settings.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/command_line.h"
@@ skipping 164 matching lines @@
   // Tag the channel name if this is a multi-install.
   if (add_multi_modifier && state.is_multi_install()) {
     if (!channel->empty())
       channel->push_back(L'-');
     channel->push_back(L'm');
   }
 
   return true;
 }
 
+#if defined(GOOGLE_CHROME_BUILD)
 // Populates |update_policy| with the UpdatePolicy enum value corresponding to a
 // DWORD read from the registry and returns true if |value| is within range.
 // If |value| is out of range, returns false without modifying |update_policy|.
 bool GetUpdatePolicyFromDword(
     const DWORD value,
     GoogleUpdateSettings::UpdatePolicy* update_policy) {
   switch (value) {
     case GoogleUpdateSettings::UPDATES_DISABLED:
     case GoogleUpdateSettings::AUTOMATIC_UPDATES:
     case GoogleUpdateSettings::MANUAL_UPDATES_ONLY:
     case GoogleUpdateSettings::AUTO_UPDATES_ONLY:
       *update_policy = static_cast<GoogleUpdateSettings::UpdatePolicy>(value);
       return true;
     default:
       LOG(WARNING) << "Unexpected update policy override value: " << value;
   }
   return false;
 }
+#endif  // defined(GOOGLE_CHROME_BUILD)
 
 // Convenience routine: GoogleUpdateSettings::UpdateDidRunStateForApp()
 // specialized for Chrome Binaries.
 bool UpdateDidRunStateForBinaries(bool did_run) {
   BrowserDistribution* dist = BrowserDistribution::GetSpecificDistribution(
       BrowserDistribution::CHROME_BINARIES);
   return GoogleUpdateSettings::UpdateDidRunStateForApp(
       dist->GetAppRegistrationData(), did_run);
 }
 
@@ skipping 755 matching lines @@
   }
 
   // If the key or value was not present, return the empty string.
   if (result == ERROR_FILE_NOT_FOUND || result == ERROR_PATH_NOT_FOUND) {
     experiment_labels->clear();
     return true;
   }
 
   return result == ERROR_SUCCESS;
 }