Remove HttpAuth::Scheme enum in favor of a string.

net/http/http_auth_handler_factory_unittest.cc

Index: net/http/http_auth_handler_factory_unittest.cc
diff --git a/net/http/http_auth_handler_factory_unittest.cc b/net/http/http_auth_handler_factory_unittest.cc
index 906f47d5bf4961b10a83e832bbb72d3c0400adb2..6d655375b6f1600f079381bc4fbe6c4217b19972 100644
--- a/net/http/http_auth_handler_factory_unittest.cc
+++ b/net/http/http_auth_handler_factory_unittest.cc
@@ -115,7 +115,7 @@ TEST(HttpAuthHandlerFactoryTest, DefaultFactory) {
         &handler);
     EXPECT_EQ(OK, rv);
     ASSERT_FALSE(handler.get() == NULL);
-    EXPECT_EQ(HttpAuth::AUTH_SCHEME_BASIC, handler->auth_scheme());
+    EXPECT_EQ("basic", handler->auth_scheme());
     EXPECT_STREQ("FooBar", handler->realm().c_str());
     EXPECT_EQ(HttpAuth::AUTH_SERVER, handler->target());
     EXPECT_FALSE(handler->encrypts_identity());
@@ -142,7 +142,7 @@ TEST(HttpAuthHandlerFactoryTest, DefaultFactory) {
         &handler);
     EXPECT_EQ(OK, rv);
     ASSERT_FALSE(handler.get() == NULL);
-    EXPECT_EQ(HttpAuth::AUTH_SCHEME_DIGEST, handler->auth_scheme());
+    EXPECT_EQ("digest", handler->auth_scheme());
     EXPECT_STREQ("FooBar", handler->realm().c_str());
     EXPECT_EQ(HttpAuth::AUTH_PROXY, handler->target());
     EXPECT_TRUE(handler->encrypts_identity());
@@ -158,7 +158,7 @@ TEST(HttpAuthHandlerFactoryTest, DefaultFactory) {
         &handler);
     EXPECT_EQ(OK, rv);
     ASSERT_FALSE(handler.get() == NULL);
-    EXPECT_EQ(HttpAuth::AUTH_SCHEME_NTLM, handler->auth_scheme());
+    EXPECT_EQ("ntlm", handler->auth_scheme());
     EXPECT_STREQ("", handler->realm().c_str());
     EXPECT_EQ(HttpAuth::AUTH_SERVER, handler->target());
     EXPECT_TRUE(handler->encrypts_identity());
@@ -175,7 +175,7 @@ TEST(HttpAuthHandlerFactoryTest, DefaultFactory) {
 #if defined(USE_KERBEROS)
     EXPECT_EQ(OK, rv);
     ASSERT_FALSE(handler.get() == NULL);
-    EXPECT_EQ(HttpAuth::AUTH_SCHEME_NEGOTIATE, handler->auth_scheme());
+    EXPECT_EQ("negotiate", handler->auth_scheme());
     EXPECT_STREQ("", handler->realm().c_str());
     EXPECT_EQ(HttpAuth::AUTH_SERVER, handler->target());
     EXPECT_TRUE(handler->encrypts_identity());