Remove support for ClientOAuth from GaiaAuthFetcher.

google_apis/gaia/gaia_constants.h

Index: google_apis/gaia/gaia_constants.h
diff --git a/google_apis/gaia/gaia_constants.h b/google_apis/gaia/gaia_constants.h
index 625ab5b922b0df9494b5d751f9abff35c51c3505..503db3a180ccb6bd812f67ce07c570454f9cb918 100644
--- a/google_apis/gaia/gaia_constants.h
+++ b/google_apis/gaia/gaia_constants.h
@@ -33,19 +33,8 @@ extern const char kGaiaOAuth2LoginRefreshToken[];
 // Used to construct a channel ID for push messaging.
 extern const char kObfuscatedGaiaId[];
 
-// Used to build ClientOAuth requests.  These are the names of keys used in
-// the json dictionaries that are sent in the protocol.
+// Used by wallet sign in helper.
 extern const char kClientOAuthEmailKey[];
-extern const char kClientOAuthPasswordKey[];
-extern const char kClientOAuthScopesKey[];
-extern const char kClientOAuthOAuth2ClientIdKey[];
-extern const char kClientOAuthFriendlyDeviceNameKey[];
-extern const char kClientOAuthAcceptsChallengesKey[];
-extern const char kClientOAuthLocaleKey[];
-extern const char kClientOAuthFallbackNameKey[];
-extern const char kClientOAuthNameKey[];
-extern const char kClientOAuthChallengeTokenKey[];
-extern const char kClientOAuthchallengeReplyKey[];
 
 }  // namespace GaiaConstants