[Mac] Use the new {EXPECT,ASSERT}_NS{EQ,NE} macros where possible.

chrome/browser/cocoa/search_engine_list_model_unittest.mm

Index: chrome/browser/cocoa/search_engine_list_model_unittest.mm
diff --git a/chrome/browser/cocoa/search_engine_list_model_unittest.mm b/chrome/browser/cocoa/search_engine_list_model_unittest.mm
index c6a45cfd5b1ecbbd4ba1af8762ea5ea453857f4b..683d4540874907a6ec520089881eb7196446880c 100644
--- a/chrome/browser/cocoa/search_engine_list_model_unittest.mm
+++ b/chrome/browser/cocoa/search_engine_list_model_unittest.mm
@@ -9,6 +9,7 @@
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_model.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 // A helper for NSNotifications. Makes a note that it's been called back.
@@ -103,7 +104,7 @@ TEST_F(SearchEngineListModelTest, Default) {
   EXPECT_EQ([model_ defaultIndex], 2U);
 
   NSString* defaultString = [[model_ searchEngines] objectAtIndex:2];
-  EXPECT_TRUE([@"google4" isEqualToString:defaultString]);
+  EXPECT_NSEQ(@"google4", defaultString);
 }
 
 // Make sure that when the back-end model changes that we get a notification.