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

chrome/common/chrome_switches.h

Index: chrome/common/chrome_switches.h
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index 40f5551331653c5a8aa086f0e840f8ccf39ad66b..ea8fe5bd4b7e6181f1b559e0e46cb080f3253b3b 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -148,15 +148,12 @@ extern const char kEnablePluginPlaceholderShadowDom[];
 extern const char kEnablePotentiallyAnnoyingSecurityFeatures[];
 extern const char kEnablePowerOverlay[];
 extern const char kEnablePrintPreviewRegisterPromos[];
-extern const char kEnablePrivetStorage[];
 extern const char kEnableProfiling[];
 extern const char kEnableQueryExtraction[];
 extern const char kEnableQuic[];
 extern const char kEnableQuicPacing[];
 extern const char kEnableQuicPortSelection[];
-extern const char kEnableReaderModeToolbarIcon[];
 extern const char kEnableSavePasswordBubble[];
-extern const char kEnableSdchOverHttps[];
 extern const char kEnableSdchPersistence[];
 extern const char kEnableSessionCrashedBubble[];
 extern const char kEnableSettingsWindow[];
@@ -168,7 +165,6 @@ extern const char kEnableSupervisedUserManagedBookmarksFolder[];
 extern const char kEnableSyncArticles[];
 extern const char kEnableTabAudioMuting[];
 extern const char kEnableThumbnailRetargeting[];
-extern const char kEnableTranslateNewUX[];
 extern const char kEnableUserAlternateProtocolPorts[];
 extern const char kEnableWebAppFrame[];
 extern const char kEnableWebsiteSettingsManager[];
@@ -189,9 +185,6 @@ extern const char kForceAppMode[];
 extern const char kForceFieldTrialParams[];
 extern const char kForceFirstRun[];
 extern const char kForceVariationIds[];
-extern const char kHelp[];
-extern const char kHelpShort[];
-extern const char kHideIcons[];
 extern const char kHistoryEnableGroupByDomain[];
 extern const char kHomePage[];
 extern const char kHostRules[];
@@ -204,7 +197,6 @@ extern const char kInstallSupervisedUserWhitelists[];
 extern const char kInstantProcess[];
 extern const char kInvalidationUseGCMChannel[];
 extern const char kIpcDumpDirectory[];
-extern const char kIpcFuzzerTestcase[];
 extern const char kJavaScriptHarmony[];
 extern const char kKeepAliveForTest[];
 extern const char kKioskMode[];
@@ -225,10 +217,8 @@ extern const char kMonitoringDestinationID[];
 extern const char kNetLogCaptureMode[];
 extern const char kNoDefaultBrowserCheck[];
 extern const char kNoDisplayingInsecureContent[];
-extern const char kNoEvents[];
 extern const char kNoExperiments[];
 extern const char kNoFirstRun[];
-extern const char kNoNetworkProfileWarning[];
 extern const char kNoProxyServer[];
 extern const char kNoPings[];
 extern const char kNoServiceAutorun[];
@@ -245,7 +235,6 @@ extern const char kPermissionRequestApiScope[];
 extern const char kPermissionRequestApiUrl[];
 extern const char kPpapiFlashPath[];
 extern const char kPpapiFlashVersion[];
-extern const char kPrefetchSearchResults[];
 extern const char kPrerenderFromOmnibox[];
 extern const char kPrerenderFromOmniboxSwitchValueAuto[];
 extern const char kPrerenderFromOmniboxSwitchValueDisabled[];
@@ -276,9 +265,7 @@ extern const char kSbDisableExtensionBlacklist[];
 extern const char kServiceProcess[];
 extern const char kSilentDebuggerExtensionAPI[];
 extern const char kSilentLaunch[];
-extern const char kSetToken[];
 extern const char kShowAppList[];
-extern const char kShowIcons[];
 extern const char kShowSavedCopy[];
 extern const char kEnableShowSavedCopyPrimary[];
 extern const char kEnableShowSavedCopySecondary[];
@@ -319,7 +306,6 @@ extern const char kSyncDisableRollback[];
 extern const char kTestName[];
 extern const char kTrustedSpdyProxy[];
 extern const char kTryChromeAgain[];
-extern const char kUninstall[];
 extern const char kUnlimitedStorage[];
 extern const char kUnsafetyTreatInsecureOriginAsSecure[];
 extern const char kUseSimpleCacheBackend[];
@@ -343,16 +329,20 @@ extern const char kDisableZeroSuggest[];
 extern const char kEnableAccessibilityTabSwitcher[];
 extern const char kEnableContextualSearch[];
 extern const char kEnableDomDistillerButtonAnimation[];
+extern const char kEnableInstantSearchClicks[];
+extern const char kEnableReaderModeToolbarIcon[];
 extern const char kEnableZeroSuggestMostVisited[];
 extern const char kEnableZeroSuggestMostVisitedWithoutSerp[];
-extern const char kEnableInstantSearchClicks[];
-#endif
+extern const char kPrefetchSearchResults[];
+#endif  // defined(OS_ANDROID)
 
 #if defined(USE_ASH)
 extern const char kOpenAsh[];
 #endif
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_CHROMEOS)
+extern const char kHelp[];
+extern const char kHelpShort[];
 extern const char kPasswordStore[];
 #endif
 
@@ -365,19 +355,28 @@ extern const char kAppsKeepChromeAliveInTests[];
 extern const char kHostedAppQuitNotification[];
 extern const char kDisableHostedAppShimCreation[];
 extern const char kDisableSystemFullscreenForTesting[];
-extern const char kRelauncherProcess[];
+extern const char kEnableTranslateNewUX[];
 extern const char kMetricsClientID[];
-#endif
+extern const char kRelauncherProcess[];
+#endif  // defined(OS_MACOSX)
 
 #if defined(OS_WIN)
 extern const char kEnableCloudPrintXps[];
 extern const char kEnableProfileShortcutManager[];
 extern const char kForceDesktop[];
 extern const char kForceImmersive[];
+extern const char kHideIcons[];
+extern const char kNoNetworkProfileWarning[];
 extern const char kRelaunchShortcut[];
+extern const char kShowIcons[];
+extern const char kUninstall[];
 extern const char kViewerLaunchViaAppId[];
 extern const char kWaitForMutex[];
 extern const char kWindows8Search[];
+#endif  // defined(OS_WIN)
+
+#if defined(ENABLE_IPC_FUZZER)
+extern const char kIpcFuzzerTestcase[];
 #endif
 
 #if defined(ENABLE_PRINT_PREVIEW) && !defined(OFFICIAL_BUILD)