Enable web-based sign in flow by default. Can use command line argument

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 096926b9a85d8d06bd0d1021e58cfdb690b6dda3..aca81bab1532a85c882ca51f3c888b312926f6a3 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1346,8 +1346,8 @@ const char kMaxSpdyConcurrentStreams[]      = "max-spdy-concurrent-streams";
 // all of its state.
 const char kUserDataDir[]                   = "user-data-dir";
 
-// Uses the GAIA web-based signin flow instead of the native UI signin flow.
-const char kUseWebBasedSigninFlow[]         = "use-web-based-signin-flow";
+// Uses the /ClientLogin signin flow instead of the web-based signin flow.
+const char kUseClientLoginSigninFlow[]         = "use-client-login-signin-flow";
 
 // Specifies a custom URL for the server which reports variation data to the
 // client. See variations_service.cc.