[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/binding_access_checker.h

Index: extensions/renderer/bindings/binding_access_checker.h
diff --git a/extensions/renderer/binding_access_checker.h b/extensions/renderer/bindings/binding_access_checker.h
similarity index 86%
rename from extensions/renderer/binding_access_checker.h
rename to extensions/renderer/bindings/binding_access_checker.h
index b0122a89b7b23b8b3d6539550f58f2fc5c8eaff3..7f9ccc25d0aaa0394d706b61ee85e9393318f0e6 100644
--- a/extensions/renderer/binding_access_checker.h
+++ b/extensions/renderer/bindings/binding_access_checker.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef EXTENSIONS_RENDERER_BINDING_ACCESS_CHECKER_H_
-#define EXTENSIONS_RENDERER_BINDING_ACCESS_CHECKER_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_BINDING_ACCESS_CHECKER_H_
+#define EXTENSIONS_RENDERER_BINDINGS_BINDING_ACCESS_CHECKER_H_
 
 #include <string>
 
@@ -42,4 +42,4 @@ class BindingAccessChecker {
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_BINDING_ACCESS_CHECKER_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_BINDING_ACCESS_CHECKER_H_