Add a gyp flag to enable dcheck by default in release without

chrome/browser/chrome_browser_main_unittest.cc

 // Copyright (c) 2011 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.
 
 #include <string>
 #include <vector>
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/chrome_content_browser_client.h"
@@ skipping 59 matching lines @@
   // ContentClient interfaces.
   scoped_ptr<content::BrowserMainParts> bw;
   if (content::GetContentClient()) {
     bw.reset(content::GetContentClient()->browser()->CreateBrowserMainParts(
         *params));
   } else {
     chrome::ChromeContentBrowserClient ccbc;
     bw.reset(ccbc.CreateBrowserMainParts(*params));
   }
   ChromeBrowserMainParts* cbw = static_cast<ChromeBrowserMainParts*>(bw.get());
+#if defined(NDEBUG) && defined(DCHECK_ALWAYS_ON)
+  EXPECT_DEATH(cbw->WarmConnectionFieldTrial(),
+                     "Not a valid socket reuse policy group");
+#else
   EXPECT_DEBUG_DEATH(cbw->WarmConnectionFieldTrial(),
                      "Not a valid socket reuse policy group");
+#endif
 }