Refactor net tests to use GMock matchers for checking net::Error results

net/http/http_auth_handler_basic_unittest.cc

Index: net/http/http_auth_handler_basic_unittest.cc
diff --git a/net/http/http_auth_handler_basic_unittest.cc b/net/http/http_auth_handler_basic_unittest.cc
index 4b8c9ff5a99f33d08ff93a9c31ad22171e89a196..72db6ef26b3d3b5db510b7fe298956b50757994a 100644
--- a/net/http/http_auth_handler_basic_unittest.cc
+++ b/net/http/http_auth_handler_basic_unittest.cc
@@ -14,8 +14,12 @@
 #include "net/http/http_auth_challenge_tokenizer.h"
 #include "net/http/http_request_info.h"
 #include "net/ssl/ssl_info.h"
+#include "net/test/gtest_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using net::test::IsOk;
+
 namespace net {
 
 TEST(HttpAuthHandlerBasicTest, GenerateAuthToken) {
@@ -48,7 +52,7 @@ TEST(HttpAuthHandlerBasicTest, GenerateAuthToken) {
     TestCompletionCallback callback;
     int rv = basic->GenerateAuthToken(&credentials, &request_info,
                                       callback.callback(), &auth_token);
-    EXPECT_EQ(OK, rv);
+    EXPECT_THAT(rv, IsOk());
     EXPECT_STREQ(tests[i].expected_credentials, auth_token.c_str());
   }
 }