Remove the web-ui task manager unused stuffs for non-ChromeOS.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 56c1e00b5ea9057739d8219bdbdf11dab92d5799..6d4afde8c9ea05b5ab5b7242bdd9af8c036f51e7 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1233,9 +1233,6 @@ const char kVisitURLs[]                     = "visit-urls";
 // The number of times the PageCycler should iterate through the list of URLs.
 const char kVisitURLsCount[]                = "visit-urls-count";
 
-// Use experimental WebUI task manager dialog.
-const char kWebUITaskManager[]              = "webui-task-manager";
-
 // Adds the given extension ID to all the permission whitelists.
 const char kWhitelistedExtensionID[]        = "whitelisted-extension-id";