Move some content url constants to /url.

url/url_constants.cc

Index: url/url_constants.cc
diff --git a/tools/clang/blink_gc_plugin/tests/own_ptr_to_gc_managed_class.cpp b/url/url_constants.cc
similarity index 54%
copy from tools/clang/blink_gc_plugin/tests/own_ptr_to_gc_managed_class.cpp
copy to url/url_constants.cc
index 626f804299e38f6a2b0d4a55ba4882e50aeb333d..7df30dac98cfb2eb6afcbf3618bb1c877df30f66 100644
--- a/tools/clang/blink_gc_plugin/tests/own_ptr_to_gc_managed_class.cpp
+++ b/url/url_constants.cc
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "own_ptr_to_gc_managed_class.h"
+#include "url/url_constants.h"
 
-namespace WebCore {
+namespace url {
 
-void HeapObject::trace(Visitor* visitor) { }
+const char kHttpScheme[] = "http";
+const char kHttpsScheme[] = "https";
 
-}
+}  // namespace url