IDL: Clean up argument conversion error handling

Source/bindings/tests/results/core/V8TestInterface.cpp

 // Copyright 2014 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.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #if ENABLE(CONDITION)
 #include "V8TestInterface.h"
 
@@ skipping 1381 matching lines @@
 #if ENABLE(PARTIAL_CONDITION)
 static void partialVoidMethodPartialCallbackTypeArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod("partialVoidMethodPartialCallbackTypeArg", "TestInterface", 1, info.Length(), info.GetIsolate()), info.GetIsolate());
         return;
     }
     TestInterfaceImplementation* impl = V8TestInterface::toImpl(info.Holder());
     ScriptValue partialCallbackTypeArg;
     {
-        v8::TryCatch block;
-        V8RethrowTryCatchScope rethrow(block);
         partialCallbackTypeArg = ScriptValue(ScriptState::current(info.GetIsolate()), info[0]);
     }
     TestPartialInterface::partialVoidMethodPartialCallbackTypeArg(*impl, partialCallbackTypeArg);
 }
 #endif // ENABLE(PARTIAL_CONDITION)
 
 #if ENABLE(PARTIAL_CONDITION)
 static void partialVoidMethodPartialCallbackTypeArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
@@ skipping 751 matching lines @@
 
     ScriptState::Scope scope(scriptState);
     v8::Handle<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::SetterContext, "stringAttribute", "TestInterfaceImplementation", scriptState->context()->Global(), scriptState->isolate());
     return PrivateScriptRunner::runDOMAttributeSetter(scriptState, scriptStateInUserScript, "TestInterfaceImplementation", "stringAttribute", holder, v8String(scriptState->isolate(), cppValue));
 }
 
 } // namespace blink
 #endif // ENABLE(CONDITION)