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

chrome/common/chrome_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.
 
 // A handful of resource-like constants related to the Chrome application.
 
 #ifndef CHROME_COMMON_CHROME_CONSTANTS_H_
 #define CHROME_COMMON_CHROME_CONSTANTS_H_
 
 #include "base/files/file_path.h"
 
 #if defined(OS_WIN)
 #if defined(GOOGLE_CHROME_BUILD)
 #define PRODUCT_STRING_PATH L"Google\\Chrome"
 #elif defined(CHROMIUM_BUILD)
 #define PRODUCT_STRING_PATH L"Chromium"
 #else
 #error Unknown branding
 #endif
 #endif  // defined(OS_WIN)
 
 namespace chrome {
 
 extern const char kChromeVersion[];
 
+#if defined(OS_WIN)
 extern const char kChromeVersionEnvVar[];
+#endif
 
 extern const base::FilePath::CharType kBrowserProcessExecutableName[];
 extern const base::FilePath::CharType kHelperProcessExecutableName[];
 extern const base::FilePath::CharType kBrowserProcessExecutablePath[];
 extern const base::FilePath::CharType kHelperProcessExecutablePath[];
 extern const base::FilePath::CharType kBrowserProcessExecutableNameChromium[];
 extern const base::FilePath::CharType kHelperProcessExecutableNameChromium[];
 extern const base::FilePath::CharType kBrowserProcessExecutablePathChromium[];
 extern const base::FilePath::CharType kHelperProcessExecutablePathChromium[];
 #if defined(OS_MACOSX)
 // NOTE: if you change the value of kFrameworkName, please don't forget to
 // update components/test/run_all_unittests.cc as well.
 // TODO(tfarina): Remove the comment above, when you fix components to use plist
 // on Mac.
 extern const base::FilePath::CharType kFrameworkName[];
 
 // The helper .app bundle name and executable name may have one of these
 // suffixes to identify specific features, or it may have no suffix at all.
 // This is a NULL-terminated array of strings. If kHelperFlavorSuffixes
 // contains "EN", "MF", and NULL, it indicates that if the normal helper is
 // named Chromium Helper.app, helper executables could show up at any of
 // Chromium Helper.app/Contents/MacOS/Chromium Helper,
 // Chromium Helper EN.app/Contents/MacOS/Chromium Helper EN, and
 // Chromium Helper MF.app/Contents/MacOS/Chromium Helper MF.
 extern const base::FilePath::CharType* const kHelperFlavorSuffixes[];
 #endif  // OS_MACOSX
 #if defined(OS_WIN)
+extern const base::FilePath::CharType kBrowserResourcesDll[];
 extern const base::FilePath::CharType kMetroDriverDll[];
-extern const wchar_t kStatusTrayWindowClass[];
+extern const base::FilePath::CharType kStatusTrayWindowClass[];
 #endif  // defined(OS_WIN)
-extern const wchar_t kCrashReportLog[];
-extern const wchar_t kTestingInterfaceDLL[];
+
 extern const char    kInitialProfile[];
 extern const char    kMultiProfileDirPrefix[];
 extern const base::FilePath::CharType kGuestProfileDir[];
 extern const base::FilePath::CharType kSystemProfileDir[];
-extern const wchar_t kBrowserResourcesDll[];
 
 // filenames
 extern const base::FilePath::CharType kAffiliationDatabaseFileName[];
 extern const base::FilePath::CharType kCacheDirname[];
 extern const base::FilePath::CharType kChannelIDFilename[];
 extern const base::FilePath::CharType kCookieFilename[];
 extern const base::FilePath::CharType kCRLSetFilename[];
 extern const base::FilePath::CharType kCustomDictionaryFileName[];
 extern const base::FilePath::CharType kExtensionActivityLogFilename[];
 extern const base::FilePath::CharType kExtensionsCookieFilename[];
 extern const base::FilePath::CharType kFirstRunSentinel[];
 extern const base::FilePath::CharType kGCMStoreDirname[];
-extern const base::FilePath::CharType kJumpListIconDirname[];
 extern const base::FilePath::CharType kLocalStateFilename[];
 extern const base::FilePath::CharType kLocalStorePoolName[];
 extern const base::FilePath::CharType kLoginDataFileName[];
 extern const base::FilePath::CharType kMediaCacheDirname[];
 extern const base::FilePath::CharType kNetworkPersistentStateFilename[];
-extern const base::FilePath::CharType kNewTabThumbnailsFilename[];
 extern const base::FilePath::CharType kPreferencesFilename[];
 extern const base::FilePath::CharType kProtectedPreferencesFilenameDeprecated[];
 extern const base::FilePath::CharType kReadmeFilename[];
 extern const base::FilePath::CharType kResetPromptMementoFilename[];
 extern const base::FilePath::CharType kSafeBrowsingBaseFilename[];
 extern const base::FilePath::CharType kSecurePreferencesFilename[];
 extern const base::FilePath::CharType kServiceStateFileName[];
 extern const base::FilePath::CharType kShortcutsDatabaseName[];
 extern const base::FilePath::CharType kSingletonCookieFilename[];
 extern const base::FilePath::CharType kSingletonLockFilename[];
 extern const base::FilePath::CharType kSingletonSocketFilename[];
 extern const base::FilePath::CharType kSupervisedUserSettingsFilename[];
-extern const base::FilePath::CharType kSyncCredentialsFilename[];
 extern const base::FilePath::CharType kThemePackFilename[];
 extern const base::FilePath::CharType kWebAppDirname[];
 
+#if defined(OS_WIN)
+extern const base::FilePath::CharType kJumpListIconDirname[];
+#endif
+
 // File name of the Pepper Flash plugin on different platforms.
 extern const base::FilePath::CharType kPepperFlashPluginFilename[];
 
 // directory names
+#if defined(OS_WIN)
 extern const wchar_t kUserDataDirname[];
+#endif
 
 // Fraction of the total number of processes to be used for hosting
 // extensions. If we have more extensions than this percentage, we will start
 // combining extensions in existing processes. This allows web pages to have
 // enough render processes and not be starved when a lot of extensions are
 // installed.
 extern const float kMaxShareOfExtensionProcesses;
 
 #if defined(OS_LINUX)
 // The highest and lowest assigned OOM score adjustment
@@ skipping 35 matching lines @@
 
 // Used to identify the application to the system AV function in Windows.
 extern const char kApplicationClientIDStringForAVScanning[];
 
 // The largest reasonable length we'd assume for a meta tag attribute.
 extern const size_t kMaxMetaTagAttributeLength;
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_CONSTANTS_H_