DevTools: consistently use Maybe for optional values in the protocol generator.

third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_cpp.template

Index: third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_cpp.template
diff --git a/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_cpp.template b/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_cpp.template
index 96db1577221ec1589daab6ddb4cb04593b9918e0..674e7a8737b846b84d88bc147d9560cc5b23595a 100644
--- a/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_cpp.template
+++ b/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_cpp.template
@@ -9,16 +9,10 @@
 namespace blink {
 namespace protocol {
 
-template<>
-PassRefPtr<JSONValue> toValue(const String& param)
-{
-    return JSONString::create(param);
-}
-
-OptionalValue<String> optional(const String& value)
-{
-    return value.isNull() ? OptionalValue<String>() : OptionalValue<String>(value);
-}
+PassRefPtr<JSONValue> toValue(int value) { return JSONBasicValue::create(value); }
+PassRefPtr<JSONValue> toValue(double value) { return JSONBasicValue::create(value); }
+PassRefPtr<JSONValue> toValue(bool value) { return JSONBasicValue::create(value); }
+PassRefPtr<JSONValue> toValue(const String& param) { return JSONString::create(param); }
 
 // ------------- Enum values from types.
 {% for domain in api.domains %}