Improve handling of failed integer type conversions.

Source/bindings/templates/attributes.cpp

 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 {% filter conditional(attribute.conditional_string) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_expose_js_accessors %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::PropertyCallbackInfo<v8::Value>& info
 {%- endif %})
 {
@@ skipping 106 matching lines @@
 {##############################################################################}
 {% macro attribute_setter(attribute, world_suffix) %}
 {% filter conditional(attribute.conditional_string) %}
 static void {{attribute.name}}AttributeSetter{{world_suffix}}(
 {%- if attribute.is_expose_js_accessors %}
 v8::Local<v8::Value> jsValue, const v8::FunctionCallbackInfo<v8::Value>& info
 {%- else %}
 v8::Local<v8::Value> jsValue, const v8::PropertyCallbackInfo<void>& info
 {%- endif %})
 {
-    {% if attribute.is_setter_raises_exception or
-          attribute.has_strict_type_checking %}
+    {% if attribute.has_setter_exception_state %}
     ExceptionState exceptionState(ExceptionState::SetterContext, "{{attribute.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {% if attribute.has_strict_type_checking %}
     {# Type checking for interface types (if interface not implemented, throw
        TypeError), per http://www.w3.org/TR/WebIDL/#es-interface #}
     if (!isUndefinedOrNull(jsValue) && !V8{{attribute.idl_type}}::hasInstance(jsValue, info.GetIsolate(), worldType(info.GetIsolate()))) {
         exceptionState.throwTypeError("The provided value is not of type '{{attribute.idl_type}}'.");
         exceptionState.throwIfNeeded();
         return;
     }
@@ skipping 66 matching lines @@
     {% endif %}
     {% if attribute.has_custom_setter %}
     {{v8_class}}::{{attribute.name}}AttributeSetterCustom(jsValue, info);
     {% else %}
     {{cpp_class}}V8Internal::{{attribute.name}}AttributeSetter{{world_suffix}}(jsValue, info);
     {% endif %}
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 {% endfilter %}
 {% endmacro %}