IDL: Clean up argument conversion error handling

Source/bindings/tests/results/core/V8TestObject.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"
 #include "V8TestObject.h"
 
 #include "bindings/core/v8/BindingSecurity.h"
@@ skipping 5632 matching lines @@
 
 static void voidMethodVoidCallbackFunctionArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod("voidMethodVoidCallbackFunctionArg", "TestObject", 1, info.Length(), info.GetIsolate()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     ScriptValue voidCallbackFunctionArg;
     {
-        v8::TryCatch block;
-        V8RethrowTryCatchScope rethrow(block);
         voidCallbackFunctionArg = ScriptValue(ScriptState::current(info.GetIsolate()), info[0]);
     }
     impl->voidMethodVoidCallbackFunctionArg(voidCallbackFunctionArg);
 }
 
 static void voidMethodVoidCallbackFunctionArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodVoidCallbackFunctionArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void voidMethodAnyCallbackFunctionOptionalAnyArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod("voidMethodAnyCallbackFunctionOptionalAnyArg", "TestObject", 1, info.Length(), info.GetIsolate()), info.GetIsolate());
         return;
     }
     TestObject* impl = V8TestObject::toImpl(info.Holder());
     ScriptValue anyCallbackFunctionOptionalAnyArgArg;
     {
-        v8::TryCatch block;
-        V8RethrowTryCatchScope rethrow(block);
         anyCallbackFunctionOptionalAnyArgArg = ScriptValue(ScriptState::current(info.GetIsolate()), info[0]);
     }
     impl->voidMethodAnyCallbackFunctionOptionalAnyArg(anyCallbackFunctionOptionalAnyArgArg);
 }
 
 static void voidMethodAnyCallbackFunctionOptionalAnyArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestObjectV8Internal::voidMethodAnyCallbackFunctionOptionalAnyArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
@@ skipping 5367 matching lines @@
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Handle<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::SetterContext, "enumForPrivateScript", "TestObject", scriptState->context()->Global(), scriptState->isolate());
     return PrivateScriptRunner::runDOMAttributeSetter(scriptState, scriptStateInUserScript, "TestObject", "enumForPrivateScript", holder, v8String(scriptState->isolate(), cppValue));
 }
 
 } // namespace blink