Added unpacking step

chrome/installer/mac/app/testing/OmahaXMLRequest_test.mm

 // Copyright 2016 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.
 
 #import "chrome/installer/mac/app/OmahaXMLRequest.h"
 
+#include "base/base_paths.h"
+#include "base/files/file_path.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
+#include "base/path_service.h"
+#include "base/strings/sys_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 TEST(OmahaXMLRequestTest, CreateReturnsValidXML) {
   base::scoped_nsobject<NSXMLDocument> xml_body_(
       [OmahaXMLRequest createXMLRequestBody]);
   ASSERT_TRUE(xml_body_);
 
-  NSString* requestDTDLocation = [[[[NSBundle mainBundle] bundlePath]
-      stringByAppendingPathComponent:
-          @"../../chrome/installer/mac/app/testing/requestCheck.dtd"]
-      stringByResolvingSymlinksInPath];
+  base::FilePath path;
+  PathService::Get(base::DIR_SOURCE_ROOT, &path);
+  path = path.AppendASCII("chrome/test/data/mac_installer/requestCheck.dtd");
+  NSString* requestDTDLocation = base::SysUTF8ToNSString(path.value());
   NSData* requestDTDData = [NSData dataWithContentsOfFile:requestDTDLocation];
   ASSERT_TRUE(requestDTDData);
 
   NSError* error;
   NSXMLDTD* requestXMLChecker =
       [[NSXMLDTD alloc] initWithData:requestDTDData options:0 error:&error];
   [requestXMLChecker setName:@"request"];
   [xml_body_ setDTD:requestXMLChecker];
   EXPECT_TRUE([xml_body_ validateAndReturnError:&error]);
 }
 
 }  // namespace