Make new chrome UI security model the default.

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 f781bafc90355f97365fdeb4ca62d8f25b181ba8..347f5b4fd80e7af270b0b79b229f6feebda2e360 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -839,9 +839,6 @@ const char kNaClLoaderProcess[]             = "nacl-loader";
 // Causes the Native Client process to display a dialog on launch.
 const char kNaClStartupDialog[]             = "nacl-startup-dialog";
 
-// Enables the new security model for "chrome" URLs.
-const char kNewChromeUISecurityModel[]      = "new-chrome-ui-security-model";
-
 // Disables the default browser check. Useful for UI/browser tests where we
 // want to avoid having the default browser info-bar displayed.
 const char kNoDefaultBrowserCheck[]         = "no-default-browser-check";