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

chrome/common/chrome_constants.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/common/chrome_constants.h"
 
 #include "base/files/file_path.h"
 
 #define FPL FILE_PATH_LITERAL
 
 #if defined(OS_MACOSX)
 #define CHROMIUM_PRODUCT_STRING "Chromium"
 #if defined(GOOGLE_CHROME_BUILD)
 #define PRODUCT_STRING "Google Chrome"
 #elif defined(CHROMIUM_BUILD)
 #define PRODUCT_STRING "Chromium"
 #else
 #error Unknown branding
 #endif
 #endif  // defined(OS_MACOSX)
 
 namespace chrome {
 
+#if defined(OS_WIN)
 const char kChromeVersionEnvVar[] = "CHROME_VERSION";
+#endif
 
 // The following should not be used for UI strings; they are meant
 // for system strings only. UI changes should be made in the GRD.
 //
 // There are four constants used to locate the executable name and path:
 //
 //     kBrowserProcessExecutableName
 //     kHelperProcessExecutableName
 //     kBrowserProcessExecutablePath
 //     kHelperProcessExecutablePath
@@ skipping 82 matching lines @@
     FPL(PRODUCT_STRING " Framework.framework");
 
 const char* const kHelperFlavorSuffixes[] = {
   FPL("EH"),  // Executable heap
   FPL("NP"),  // No PIE
   NULL
 };
 #endif  // OS_MACOSX
 
 #if defined(OS_WIN)
+const base::FilePath::CharType kBrowserResourcesDll[] = FPL("chrome.dll");
 const base::FilePath::CharType kMetroDriverDll[] = FPL("metro_driver.dll");
-const wchar_t kStatusTrayWindowClass[] = L"Chrome_StatusTrayWindow";
+const base::FilePath::CharType kStatusTrayWindowClass[] =
+    FPL("Chrome_StatusTrayWindow");
 #endif  // defined(OS_WIN)
 
-const wchar_t kCrashReportLog[] = L"Reported Crashes.txt";
-const wchar_t kTestingInterfaceDLL[] = L"testing_interface.dll";
 const char    kInitialProfile[] = "Default";
 const char    kMultiProfileDirPrefix[] = "Profile ";
 const base::FilePath::CharType kGuestProfileDir[] = FPL("Guest Profile");
 const base::FilePath::CharType kSystemProfileDir[] = FPL("System Profile");
-const wchar_t kBrowserResourcesDll[] = L"chrome.dll";
 
 // filenames
 const base::FilePath::CharType kAffiliationDatabaseFileName[] =
     FPL("Affiliation Database");
 const base::FilePath::CharType kCacheDirname[] = FPL("Cache");
 const base::FilePath::CharType kChannelIDFilename[] = FPL("Origin Bound Certs");
 const base::FilePath::CharType kCookieFilename[] = FPL("Cookies");
 const base::FilePath::CharType kCRLSetFilename[] =
     FPL("Certificate Revocation Lists");
 const base::FilePath::CharType kCustomDictionaryFileName[] =
     FPL("Custom Dictionary.txt");
 const base::FilePath::CharType kExtensionActivityLogFilename[] =
     FPL("Extension Activity");
 const base::FilePath::CharType kExtensionsCookieFilename[] =
     FPL("Extension Cookies");
 const base::FilePath::CharType kFirstRunSentinel[] = FPL("First Run");
 const base::FilePath::CharType kGCMStoreDirname[] = FPL("GCM Store");
-const base::FilePath::CharType kJumpListIconDirname[] = FPL("JumpListIcons");
 const base::FilePath::CharType kLocalStateFilename[] = FPL("Local State");
 const base::FilePath::CharType kLocalStorePoolName[] = FPL("LocalStorePool");
 const base::FilePath::CharType kLoginDataFileName[] = FPL("Login Data");
 const base::FilePath::CharType kMediaCacheDirname[] = FPL("Media Cache");
 const base::FilePath::CharType kNetworkPersistentStateFilename[] =
     FPL("Network Persistent State");
-const base::FilePath::CharType kNewTabThumbnailsFilename[] =
-    FPL("Top Thumbnails");
 const base::FilePath::CharType kPreferencesFilename[] = FPL("Preferences");
 const base::FilePath::CharType kProtectedPreferencesFilenameDeprecated[] =
     FPL("Protected Preferences");
 const base::FilePath::CharType kReadmeFilename[] = FPL("README");
 const base::FilePath::CharType kResetPromptMementoFilename[] =
     FPL("Reset Prompt Memento");
 const base::FilePath::CharType kSafeBrowsingBaseFilename[] =
     FPL("Safe Browsing");
 const base::FilePath::CharType kSecurePreferencesFilename[] =
     FPL("Secure Preferences");
 const base::FilePath::CharType kServiceStateFileName[] = FPL("Service State");
 const base::FilePath::CharType kShortcutsDatabaseName[] = FPL("Shortcuts");
 const base::FilePath::CharType kSingletonCookieFilename[] =
     FPL("SingletonCookie");
 const base::FilePath::CharType kSingletonLockFilename[] = FPL("SingletonLock");
 const base::FilePath::CharType kSingletonSocketFilename[] =
     FPL("SingletonSocket");
 const base::FilePath::CharType kSupervisedUserSettingsFilename[] =
     FPL("Managed Mode Settings");
-const base::FilePath::CharType kSyncCredentialsFilename[] =
-    FPL("Sync Credentials");
 const base::FilePath::CharType kThemePackFilename[] = FPL("Cached Theme.pak");
 const base::FilePath::CharType kWebAppDirname[] = FPL("Web Applications");
 
+#if defined(OS_WIN)
+const base::FilePath::CharType kJumpListIconDirname[] = FPL("JumpListIcons");
+#endif
+
 // File name of the Pepper Flash plugin on different platforms.
 const base::FilePath::CharType kPepperFlashPluginFilename[] =
 #if defined(OS_MACOSX)
     FPL("PepperFlashPlayer.plugin");
 #elif defined(OS_WIN)
     FPL("pepflashplayer.dll");
 #else  // OS_LINUX, etc.
     FPL("libpepflashplayer.so");
 #endif
 
 // directory names
+#if defined(OS_WIN)
 const wchar_t kUserDataDirname[] = L"User Data";
+#endif
 
 const float kMaxShareOfExtensionProcesses = 0.30f;
 
 #if defined(OS_LINUX)
 const int kLowestRendererOomScore = 300;
 const int kHighestRendererOomScore = 1000;
 #endif
 
 #if defined(OS_WIN)
 const wchar_t kMetroNavigationAndSearchMessage[] =
@@ skipping 23 matching lines @@
 // user can select for different file types.
 // {2676A9A2-D919-4FEE-9187-152100393AB2}
 const char kApplicationClientIDStringForAVScanning[] =
     "2676A9A2-D919-4FEE-9187-152100393AB2";
 
 const size_t kMaxMetaTagAttributeLength = 2000;
 
 }  // namespace chrome
 
 #undef FPL