[net/http auth] Use strings to identify authentication schemes.

net/http/http_auth_handler_basic.cc

Index: net/http/http_auth_handler_basic.cc
diff --git a/net/http/http_auth_handler_basic.cc b/net/http/http_auth_handler_basic.cc
index 27b892bb016b2670266a0c7c6ce40fd1e95cb41a..4c509f46bb2d7b2e42bd7f4511575258adc567a3 100644
--- a/net/http/http_auth_handler_basic.cc
+++ b/net/http/http_auth_handler_basic.cc
@@ -18,6 +18,8 @@ namespace net {
 
 namespace {
 
+const char* const kBasicSchemeName = "basic";
+
 // Parses a realm from an auth challenge, and converts to UTF8-encoding.
 // Returns whether the realm is invalid or the parameters are invalid.
 //
@@ -53,16 +55,14 @@ bool ParseRealm(const HttpAuthChallengeTokenizer& tokenizer,
 }  // namespace
 
 bool HttpAuthHandlerBasic::Init(HttpAuthChallengeTokenizer* challenge) {
-  auth_scheme_ = HttpAuth::AUTH_SCHEME_BASIC;
-  score_ = 1;
-  properties_ = 0;
+  auth_scheme_ = kBasicSchemeName;
   return ParseChallenge(challenge);
 }
 
 bool HttpAuthHandlerBasic::ParseChallenge(
     HttpAuthChallengeTokenizer* challenge) {
   // Verify the challenge's auth-scheme.
-  if (!base::LowerCaseEqualsASCII(challenge->scheme(), "basic"))
+  if (!challenge->SchemeIs(kBasicSchemeName))
     return false;
 
   std::string realm;