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

net/http/http_auth_sspi_win_unittest.cc

Index: net/http/http_auth_sspi_win_unittest.cc
diff --git a/net/http/http_auth_sspi_win_unittest.cc b/net/http/http_auth_sspi_win_unittest.cc
index c2841732283d63a1e015eca2cbdbf130cd8f4eb2..c9d6cfc54c80d3c9e689935759b74a977f421ffb 100644
--- a/net/http/http_auth_sspi_win_unittest.cc
+++ b/net/http/http_auth_sspi_win_unittest.cc
@@ -6,8 +6,13 @@
 #include "net/http/http_auth_challenge_tokenizer.h"
 #include "net/http/http_auth_sspi_win.h"
 #include "net/http/mock_sspi_library_win.h"
+#include "net/test/gtest_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using net::test::IsError;
+using net::test::IsOk;
+
 namespace net {
 
 namespace {
@@ -46,7 +51,7 @@ TEST(HttpAuthSSPITest, DetermineMaxTokenLength_Normal) {
   mock_library.ExpectQuerySecurityPackageInfo(L"NTLM", SEC_E_OK, &package_info);
   ULONG max_token_length = kMaxTokenLength;
   int rv = DetermineMaxTokenLength(&mock_library, L"NTLM", &max_token_length);
-  EXPECT_EQ(OK, rv);
+  EXPECT_THAT(rv, IsOk());
   EXPECT_EQ(1337u, max_token_length);
 }
 
@@ -56,7 +61,7 @@ TEST(HttpAuthSSPITest, DetermineMaxTokenLength_InvalidPackage) {
                                               NULL);
   ULONG max_token_length = kMaxTokenLength;
   int rv = DetermineMaxTokenLength(&mock_library, L"Foo", &max_token_length);
-  EXPECT_EQ(ERR_UNSUPPORTED_AUTH_SCHEME, rv);
+  EXPECT_THAT(rv, IsError(ERR_UNSUPPORTED_AUTH_SCHEME));
   // |DetermineMaxTokenLength()| interface states that |max_token_length| should
   // not change on failure.
   EXPECT_EQ(100u, max_token_length);