IDL: make optional arguments (without default) explicit sometimes

Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
@@ skipping 44 matching lines @@
 class ExecutionContext;
 class ExceptionState;
 class LocalFrame;
 class NodeFilter;
 class XPathNSResolver;
 
 namespace TraceEvent {
 class ConvertableToTraceFormat;
 }
 
-const int kMaxRecursionDepth = 22;
-
 // Helpers for throwing JavaScript TypeErrors for arity mismatches.
 void setArityTypeError(ExceptionState&, const char* valid, unsigned provided);
 v8::Local<v8::Value> createMinimumArityTypeErrorForMethod(const char* method, const char* type, unsigned expected, unsigned provided, v8::Isolate*);
 v8::Local<v8::Value> createMinimumArityTypeErrorForConstructor(const char* type, unsigned expected, unsigned provided, v8::Isolate*);
 void setMinimumArityTypeError(ExceptionState&, unsigned expected, unsigned provided);
 
 v8::ArrayBuffer::Allocator* v8ArrayBufferAllocator();
 
 template<typename CallbackInfo, typename V>
 inline void v8SetReturnValue(const CallbackInfo& info, V v)
@@ skipping 879 matching lines @@
         m_block.ReThrow();
     }
 
 private:
     v8::TryCatch& m_block;
 };
 
 } // namespace blink
 
 #endif // V8Binding_h