Simplify the user agent overriding code, in preparation for moving it out of src/webkit.

content/test/webkit_support.cc

 // Copyright 2013 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 "content/test/webkit_support.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 93 matching lines @@
 #if defined(OS_MACOSX)
   mock_cr_app::RegisterMockCrApp();
 #endif
 
   // Explicitly initialize the GURL library before spawning any threads.
   // Otherwise crash may happend when different threads try to create a GURL
   // at same time.
   url_util::Initialize();
   test_environment = new TestEnvironment;
   webkit_glue::SetUserAgent(webkit_glue::BuildUserAgentFromProduct(
-      "DumpRenderTree/0.0.0.0"), false);
+      "DumpRenderTree/0.0.0.0"));
 }
 
 void TearDownTestEnvironment() {
   // Flush any remaining messages before we kill ourselves.
   // http://code.google.com/p/chromium/issues/detail?id=9500
   base::RunLoop().RunUntilIdle();
 
   if (RunningOnValgrind())
     blink::WebCache::clear();
   delete test_environment;
   test_environment = NULL;
 }
 
 }  // namespace content