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

chrome/browser/cocoa/download_util_mac_unittest.mm

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Download utility test for Mac OS X.
 
 #include "base/path_service.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/cocoa/download_util_mac.h"
 #include "chrome/common/chrome_paths.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 namespace {
 
 class DownloadUtilMacTest : public CocoaTest {
  public:
   DownloadUtilMacTest() {
     pasteboard_ = [NSPasteboard pasteboardWithUniqueName];
   }
 
@@ skipping 21 matching lines @@
   // Test to see that the object type for dragging files is available.
   NSArray* types =  [NSArray arrayWithObject:NSFilenamesPboardType];
   NSString* available = [pasteboard() availableTypeFromArray:types];
   EXPECT_TRUE(available != nil);
 
   // Ensure the path is what we expect.
   NSArray* files = [pasteboard() propertyListForType:NSFilenamesPboardType];
   ASSERT_TRUE(files != nil);
   NSString* expectedPath = [files objectAtIndex:0];
   NSString* realPath = base::SysWideToNSString(testPath.ToWStringHack());
-  EXPECT_TRUE([expectedPath isEqualToString:realPath]);
+  EXPECT_NSEQ(expectedPath, realPath);
 }
 
 }  // namespace