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

net/proxy/mojo_proxy_resolver_impl_unittest.cc

Index: net/proxy/mojo_proxy_resolver_impl_unittest.cc
diff --git a/net/proxy/mojo_proxy_resolver_impl_unittest.cc b/net/proxy/mojo_proxy_resolver_impl_unittest.cc
index e6484449624819b7e04eb1b055605f5edce63b53..277374bea43be3e429c1b3c30b373e06ab1571be 100644
--- a/net/proxy/mojo_proxy_resolver_impl_unittest.cc
+++ b/net/proxy/mojo_proxy_resolver_impl_unittest.cc
@@ -17,8 +17,13 @@
 #include "net/proxy/proxy_resolver_v8_tracing.h"
 #include "net/proxy/proxy_server.h"
 #include "net/test/event_waiter.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 {
 
@@ -208,7 +213,7 @@ TEST_F(MojoProxyResolverImplTest, GetProxyForUrl) {
   request.callback.Run(OK);
   client.WaitForResult();
 
-  EXPECT_EQ(OK, client.error());
+  EXPECT_THAT(client.error(), IsOk());
   std::vector<ProxyServer> servers =
       client.results().To<std::vector<ProxyServer>>();
   ASSERT_EQ(6u, servers.size());
@@ -247,7 +252,7 @@ TEST_F(MojoProxyResolverImplTest, GetProxyForUrlFailure) {
   request.callback.Run(ERR_FAILED);
   client.WaitForResult();
 
-  EXPECT_EQ(ERR_FAILED, client.error());
+  EXPECT_THAT(client.error(), IsError(ERR_FAILED));
   std::vector<ProxyServer> proxy_servers =
       client.results().To<std::vector<ProxyServer>>();
   EXPECT_TRUE(proxy_servers.empty());
@@ -276,7 +281,7 @@ TEST_F(MojoProxyResolverImplTest, GetProxyForUrlMultiple) {
   client1.WaitForResult();
   client2.WaitForResult();
 
-  EXPECT_EQ(OK, client1.error());
+  EXPECT_THAT(client1.error(), IsOk());
   std::vector<ProxyServer> proxy_servers1 =
       client1.results().To<std::vector<ProxyServer>>();
   ASSERT_EQ(1u, proxy_servers1.size());
@@ -285,7 +290,7 @@ TEST_F(MojoProxyResolverImplTest, GetProxyForUrlMultiple) {
   EXPECT_EQ("proxy.example.com", server1.host_port_pair().host());
   EXPECT_EQ(12345, server1.host_port_pair().port());
 
-  EXPECT_EQ(OK, client2.error());
+  EXPECT_THAT(client2.error(), IsOk());
   std::vector<ProxyServer> proxy_servers2 =
       client2.results().To<std::vector<ProxyServer>>();
   ASSERT_EQ(1u, proxy_servers1.size());