Delete unused code in chrome/common or mark them as platform specific.

chrome/installer/util/util_constants.h

 // 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.
 //
 // Defines all install related constants that need to be used by Chrome as
 // well as Chrome Installer.
 
 #ifndef CHROME_INSTALLER_UTIL_UTIL_CONSTANTS_H_
 #define CHROME_INSTALLER_UTIL_UTIL_CONSTANTS_H_
 
@@ skipping 165 matching lines @@
 extern const char kSystemLevelToast[];
 extern const char kExperimentGroup[];
 extern const char kToastResultsKey[];
 extern const char kPatch[];
 extern const char kInputFile[];
 extern const char kPatchFile[];
 extern const char kOutputFile[];
 
 }  // namespace switches
 
+namespace env_vars {
+
+extern const char kGoogleUpdateIsMachineEnvVar[];

[grt (UTC plus 2), 2015/05/11 19:43:09]

looks like the use of this was removed in r253709, so lgtm.

+
+}  // namespace env_vars
+
 extern const wchar_t kActiveSetupExe[];
 extern const wchar_t kAppLauncherGuid[];
 extern const wchar_t kChromeDll[];
 extern const wchar_t kChromeChildDll[];
 extern const wchar_t kChromeExe[];
 extern const wchar_t kChromeFrameDll[];
 extern const wchar_t kChromeFrameHelperDll[];
 extern const wchar_t kChromeFrameHelperExe[];
 extern const wchar_t kChromeFrameHelperWndClass[];
 extern const wchar_t kChromeLauncherExe[];
@@ skipping 48 matching lines @@
 const int kCourgetteErrorOffset = 300;
 const int kBsdiffErrorOffset = 600;
 
 // Arguments to --patch switch
 extern const char kCourgette[];
 extern const char kBsdiff[];
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_UTIL_CONSTANTS_H_