Add a missing check for exceptions thrown in methods implemented in private scripts

Source/bindings/templates/methods.cpp

 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     {# Local variables #}
     {% if method.has_exception_state %}
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {# Overloaded methods have length checked during overload resolution #}
@@ skipping 511 matching lines @@
     {% else %}
     {# Empty array initializers are illegal, and don\'t compile in MSVC. #}
     v8::Handle<v8::Value> *argv = 0;
     {% endif %}
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{cpp_class}}", scriptState->context()->Global(), scriptState->isolate());
     v8::TryCatch block;
     V8RethrowTryCatchScope rethrow(block);
     {% if method.idl_type == 'void' %}
     PrivateScriptRunner::runDOMMethod(scriptState, "{{cpp_class}}", "{{method.name}}", holder, {{method.arguments | length}}, argv);
     if (block.HasCaught()) {
-        PrivateScriptRunner::throwDOMExceptionInPrivateScriptIfNeeded(scriptState->isolate(), exceptionState, block.Exception());
+        if (!PrivateScriptRunner::throwDOMExceptionInPrivateScriptIfNeeded(scriptState->isolate(), exceptionState, block.Exception())) {
+            // FIXME: We should support more exceptions.
+            RELEASE_ASSERT_NOT_REACHED();
+        }
         return false;
     }
     {% else %}
     v8::Handle<v8::Value> v8Value = PrivateScriptRunner::runDOMMethod(scriptState, "{{cpp_class}}", "{{method.name}}", holder, {{method.arguments | length}}, argv);
     if (block.HasCaught()) {
         if (!PrivateScriptRunner::throwDOMExceptionInPrivateScriptIfNeeded(scriptState->isolate(), exceptionState, block.Exception())) {
-            // FIXME: We should support exceptions other than DOM exceptions.
+            // FIXME: We should support more exceptions.
             RELEASE_ASSERT_NOT_REACHED();
         }
         return false;
     }
     {{method.private_script_v8_value_to_local_cpp_value}};
     RELEASE_ASSERT(!exceptionState.hadException());
     *result = cppValue;
     {% endif %}
     return true;
 }
@@ skipping 42 matching lines @@
 v8::Handle<v8::Object> wrapper = wrap(impl.get(), info.Holder(), info.GetIsolate());
 {% else %}
 {% set constructor_class = v8_class + ('Constructor'
                                        if constructor.is_named_constructor else
                                        '') %}
 v8::Handle<v8::Object> wrapper = info.Holder();
 V8DOMWrapper::associateObjectWithWrapper<{{v8_class}}>(impl.release(), &{{constructor_class}}::wrapperTypeInfo, wrapper, info.GetIsolate(), {{wrapper_configuration}});
 {% endif %}
 v8SetReturnValue(info, wrapper);
 {% endmacro %}