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

net/websockets/websocket_errors_test.cc

Index: net/websockets/websocket_errors_test.cc
diff --git a/net/websockets/websocket_errors_test.cc b/net/websockets/websocket_errors_test.cc
index 5e48e20e83183ec1b39fcd6b49bae330db37a98c..95147c70b88c407c5f73710dcbfcb5ccd48d67f7 100644
--- a/net/websockets/websocket_errors_test.cc
+++ b/net/websockets/websocket_errors_test.cc
@@ -5,8 +5,12 @@
 #include "net/websockets/websocket_errors.h"
 
 #include "net/base/net_errors.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 {
 namespace {
 
@@ -14,7 +18,7 @@ namespace {
 // don't exhaustively test every error code, as it would be long, repetitive,
 // and add little value.
 TEST(WebSocketErrorToNetErrorTest, ResultsAreCorrect) {
-  EXPECT_EQ(OK, WebSocketErrorToNetError(kWebSocketNormalClosure));
+  EXPECT_THAT(WebSocketErrorToNetError(kWebSocketNormalClosure), IsOk());
   EXPECT_EQ(ERR_WS_PROTOCOL_ERROR,
             WebSocketErrorToNetError(kWebSocketErrorProtocolError));
   EXPECT_EQ(ERR_MSG_TOO_BIG,