Use V8 Maybe APIs in extensions/renderer

extensions/renderer/app_runtime_custom_bindings.cc

Index: extensions/renderer/app_runtime_custom_bindings.cc
diff --git a/extensions/renderer/app_runtime_custom_bindings.cc b/extensions/renderer/app_runtime_custom_bindings.cc
index 4302590d0a2cffc770bcab352000bee5da98cb7f..34e4c175d16d93d0e8144c46c76fabb43158a0da 100644
--- a/extensions/renderer/app_runtime_custom_bindings.cc
+++ b/extensions/renderer/app_runtime_custom_bindings.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
+#include "extensions/renderer/v8_maybe_helpers.h"
 #include "third_party/WebKit/public/platform/WebCString.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebBlob.h"
@@ -34,8 +35,10 @@ void SerializeToString(const v8::FunctionCallbackInfo<v8::Value>& args) {
   WebString data_webstring = data.toString();
 
   std::string v = std::string(data_webstring.utf8());
-  args.GetReturnValue().Set(
-      v8::String::NewFromUtf8(args.GetIsolate(), v.c_str()));
+  if (v.size() >= v8::String::kMaxLength)
+    return;
+  args.GetReturnValue().Set(extensions::ToV8String(args.GetIsolate(),
+                                                   v.c_str()));
 }
 
 void CreateBlob(const v8::FunctionCallbackInfo<v8::Value>& args) {